The Hardest STEM Majors in College and What Makes Them So Challenging

A widely cited 2010 study by Wake Forest economist Dr. Kevin Rask found that chemistry majors had the lowest average GPA of any undergraduate field with mathematics close behind.

Grades, however, are only part of the story. According to the National Center for Education Statistics, nearly 48 percent of students who enter a STEM bachelor’s program leave the field before graduating: about 28 percent switch to a non-STEM major, while 20 percent leave college entirely. Research presented at the American Society for Engineering Education also found that more than 60 percent of STEM attrition happens within the first two years, often before students even reach upper-division coursework.

This guide breaks down the STEM majors most consistently considered the hardest, what specifically makes them challenging, and how you can prepare for them in high school. We’ll also cover frequently asked questions and offer a framework for deciding whether one of these majors is the right fit for you.

• What Are the Hardest STEM Majors?
• Chemical Engineering
• Physics / Astrophysics
• Electrical Engineering
• Aerospace Engineering
• Computer Science
• Biochemistry
• Mathematics
• How to Decide if a Hard STEM Major is Right for You
• Are You Considering a Hard STEM Major?
• Frequently Asked Questions
• Takeaways

What Are the Hardest STEM Majors?

STEM programs emphasize what educators sometimes call “hard skills” (like programming languages, advanced mathematics, laboratory technique, and structured problem-solving), over the analytical writing and interpretation that dominate humanities curricula. Because STEM assessments often have objectively correct or incorrect answers, grade inflation has had less room to spread.

A few measurable indicators are commonly used to assess how demanding a major is:

• GPA distributions. Lower average GPAs typically indicate steeper grading and harder content. Engineering, chemistry, physics, and math consistently land at the lower end nationally.
• Attrition rates. As the NCES data above shows, nearly half of STEM entrants leave their original major.
• Time-to-degree and study hours. National Survey of Student Engagement data has shown engineering and physical science students reporting 19 or more hours of out-of-class study per week, compared to roughly 15 hours for the average undergraduate.
• Student-reported difficulty. Surveys consistently rank the same handful of majors: chemistry, engineering, physics, math at the top.

One important caveat before diving in: difficulty is also personal. A student with strong calculus instincts and an appetite for abstraction may find pure mathematics natural; the same student might struggle with the memorization load of biochemistry. The majors below are objectively demanding by national data, but your personal preparation, aptitude, and interest matter just as much as the rankings.

Chemical Engineering

Chemical engineering is one of the most consistently top-ranked difficult majors in any survey of undergraduate degrees. It combines advanced chemistry, thermodynamics, fluid dynamics, reaction engineering, and applied mathematics and asks students to use all of them at once to design real-world manufacturing and processing systems.

A look at MIT’s Course 10 (Chemical Engineering) curriculum gives a sense of the workload. Beyond the general institute requirements, chemical engineering majors at MIT take organic chemistry, differential equations, thermodynamics, chemical and biological engineering thermodynamics, fluid mechanics, transport processes, kinetics, and process design, and that’s before specialized electives.

UC Berkeley’s College of Chemistry, in internal data shared by the Academic Affairs Vice President, reports a 10-year average GPA of roughly 3.25 for chemical engineering majors, meaningfully below the average GPA of incoming Berkeley freshmen (around 3.9 in high school).

The major has a particularly steep learning curve in the second and third year, when coursework transitions from foundational science (general chemistry, physics, calculus) to coupled engineering systems where everything you’ve learned needs to work together in a single problem.

Topics that make chemical engineering hard

The subjects that drive most of the difficulty are:

• Physical chemistry and thermodynamics. Students learn how energy and matter behave at the molecular and macroscopic levels.
• Transport processes (mass, momentum, and heat transfer). The workhorse subject of the major and famous for compressing weeks of partial differential equations into single homework sets.
• Reaction kinetics and reactor design. Asks students to predict how fast a chemical reaction will run and how to build equipment that controls it.
• Process control and systems engineering. Mathematical modeling of an entire plant becomes the focus.

What makes chemical engineering distinctly hard is that the math and the science are simultaneously advanced. In a math-light science major, you can survive a shaky calculus background. In a science-light engineering major, you can survive a weak chemistry foundation. In chemical engineering, weakness in thermodynamics compounds difficulty in reactor design; gaps in differential equations make transport phenomena nearly unmanageable.

Tips for succeeding in chemical engineering

Building a solid foundation in calculus and chemistry in high school is essential; AP Calculus BC and AP Chemistry are reasonable minimums for students aiming for top chemical engineering programs.

Once in college, form study groups early, since peer explanation is especially effective in a major with so many interlocking concepts. The act of teaching a concept exposes gaps faster than re-reading the textbook.

Use office hours aggressively, especially in sophomore year, when the coursework gap widens most sharply and faculty are often surprised by how few students take advantage of the time they offer. Finally, track your understanding. Chemical engineering builds vertically, and a B+ that conceals a weak grasp of mass balances will haunt you in transport, kinetics, and beyond.

Physics / Astrophysics

Physics and astrophysics majors deal with some of the most abstract and mathematically intensive material in any undergraduate curriculum. Quantum mechanics, general relativity, statistical mechanics, and electromagnetism are subjects where the answer is rarely found by following a procedure. Average GPAs for physics majors typically land in the low 3.0 range, with some institutions reporting averages closer to 3.0 flat.

Astrophysics adds further complexity by layering observational science, large-scale computational modeling, and theoretical physics on top of the standard physics core. MIT’s physics undergraduate curriculum requires three terms of quantum mechanics for the focused major, alongside classical mechanics, electromagnetism, statistical physics, and 36 units of laboratory experience plus a senior thesis.

The difficulty here is less about memorization and more about developing the ability to reason through problems with no obvious procedural path. Physics homework rarely asks you to apply a known formula; it asks you to figure out which framework applies.

Topics that make physics / astrophysics hard

Physics and astrophysics demand a rare combination of abstract mathematical reasoning and physical intuition that few other fields require simultaneously. Building a serious calculus and chemistry foundation in high school is essential to thrive in this course.

• Classical mechanics. Taught at the upper-division level, where Lagrangian and Hamiltonian formulations replace the Newtonian intuition students built in high school.
• Electromagnetism. Taught using Maxwell’s equations in differential form.
• Quantum mechanics. Requires comfort with linear algebra, complex numbers, and the philosophical strangeness of probabilistic outcomes.
• Statistical mechanics. Macroscopic behavior is derived from microscopic states.
• Celestial mechanics and cosmology. For astrophysics students, often paired with computational modeling.

The math underpinning all of this (namely differential equations, linear algebra, complex analysis, and partial differential equations) is itself demanding. And physics courses treat that math as a tool rather than as a subject of study. Students need to be fluent rather than merely familiar; a course in quantum mechanics is not the place to be learning what an eigenvalue is.

Tips for succeeding in physics / astrophysics

Taking math ahead of physics, rather than in parallel, makes a significant difference. Students who finish linear algebra and differential equations before encountering them in physics generally have a much smoother experience than those taking both simultaneously.

When working through problem sets, resist the urge to look at solutions early, since physics rewards process fluency over answer-hunting. The student who arrives at a wrong answer through clean reasoning is closer to mastery than one who memorizes a worked solution.

Pursue research as early as you can, as faculty mentorship in a lab or research group accelerates conceptual development faster than coursework alone and is essentially required for students considering graduate study. Finally, don’t underestimate computational skill. Modern astrophysics in particular is deeply computational, and comfort with Python and numerical methods is no longer optional.

Electrical Engineering

Electrical engineering is one of the most technically demanding engineering disciplines, requiring deep fluency in circuit theory, signal processing, electromagnetics, and applied mathematics. It’s also one of the most time-intensive undergraduate majors, in part because the coursework is paired with hands-on lab requirements that don’t always show up in a course’s credit count.

Caltech’s Electrical Engineering is housed in the Division of Engineering and Applied Science and built on one of the country’s most demanding undergraduate cores. All students, regardless of major, complete two years of mathematics, including Ma 1 in calculus and analytical geometry, Ma 2 in differential equations, and Ma 3 in probability and statistics, along with Ph 1 in classical mechanics and electromagnetism and introductory programming.

EE students typically begin the track in sophomore year with ACM 95, which covers applied mathematics methods, and EE 44, focused on circuits and systems. From there, they move into upper-division courses such as signals and systems, semiconductor devices, digital circuits, and electromagnetic fields. By senior year, students choose electives in areas like communications and information theory, control and dynamical systems, photonics, and VLSI design, while also gaining hands-on experience through research.

Many students underestimate the workload until they hit upper-division courses, where abstract theoretical content (like Fourier and Laplace transforms, semiconductor physics, and electromagnetics) meets practical design work that can swallow an entire weekend.

Topics that make electrical engineering hard

Understanding why electrical engineering is so demanding starts with the core topics that define the major.

• Circuit analysis and network theory. Start manageable and accelerate fast.
• Differential equations applied to systems. Include state-space representations.
• Fourier and Laplace transforms. Used to move between time-domain and frequency-domain analysis.
• Semiconductor physics and device theory. Where quantum-mechanical effects determine how transistors actually work.
• Digital logic and computer architecture. Teaches students how computers work at the hardware level, from logic gates and circuits to processors, memory systems, and the design of efficient computing systems.
• Electromagnetics. Widely cited by undergraduates as one of the most conceptually difficult courses in any engineering curriculum.

Tips for succeeding in electrical engineering

Treat your math sequence as the cornerstone of your preparation, since multivariable calculus, differential equations, and linear algebra are the language of the entire major. You should also get into a hardware or embedded systems lab early, as internships, research assistantships, and hands-on project work can make abstract concepts much easier to understand.

Outside class, build personal projects such as microcontroller experiments, simple circuit builds, or small robotics work, which are often affordable and strongly reinforce what you learn in lectures and labs. Finally, do not try to optimize your schedule around “easy” semesters, because the major rewards steady, consistent effort more than strategic load-balancing.

Aerospace Engineering

Aerospace engineering is multidisciplinary by nature, asking students to master aerodynamics, thermodynamics, fluid dynamics, structural mechanics, and orbital mechanics concurrently. The curriculum leaves little margin for weakness in any single foundational subject. By the upper-division years, your propulsion course assumes you remember thermodynamics, your aerodynamics course assumes you’re fluent in fluid mechanics, and your spacecraft design course assumes you know both.

Georgia Tech’s aerospace engineering program is one of the country’s best, offering a curriculum that starts with a demanding foundation in calculus, physics, introductory computing, chemistry, and institute-wide core requirements. Sophomore year introduces key engineering and aerospace fundamentals, including statics and dynamics, aerospace engineering, thermodynamics, differential equations, and linear algebra, giving students their first exposure to flight mechanics and aerospace systems.

By junior year, the major becomes distinctly aerospace-focused, with courses in aerodynamics, structural mechanics, propulsion, flight dynamics and control, and computational methods, many of which include significant lab or project work. Senior year centers on the two-semester aircraft or spacecraft design capstone, where student teams complete a full conceptual design project.

Students can also choose electives in areas such as aerodynamics and fluid mechanics, structural mechanics and materials, propulsion and combustion, or guidance, navigation, and control. Meanwhile, research-focused students may pursue thesis work through Georgia Tech’s aerospace research centers, including GTRI and the Space Systems Design Lab.

The career payoff is real, with the Bureau of Labor Statistics projecting aerospace engineering jobs to grow 6 percent from 2024 to 2034, which is faster than the average for all occupations, with a median annual wage well above $120,000. But the academic path to that career is famously punishing.

Topics that make aerospace engineering hard

Understanding why aerospace engineering is so challenging starts with the core topics that make the major both mathematically intense and highly applied.

• Aerodynamics and compressible flow. Particularly in transonic and supersonic regimes.
• Propulsion systems. Includes jet, rocket, and electric propulsion.
• Structural analysis. Includes complex airframes and pressure vessels.
• Flight dynamics and control systems. Focuses on how aircraft and spacecraft move, respond to forces, and remain stable in flight.
• Orbital mechanics, spacecraft design, and astrodynamics. For students focused on space systems.

These topics are interconnected in a way that makes it hard to isolate and remediate weakness. A student who struggles with fluid dynamics will find propulsion and aerodynamics compoundingly harder; a student who struggles with linear systems will find control theory nearly opaque.

Tips for succeeding in aerospace engineering

Prioritize physics and calculus above all else in high school, as these are the load-bearing subjects for almost everything in aerospace engineering. AP Physics C, including Mechanics and Electricity and Magnetism, and AP Calculus BC are strong targets. You should also use visualization tools and simulations, such as XFLR5 for airfoil analysis or GMAT for orbital trajectories, to build intuition beyond equations alone.

Joining a design team can also make a major difference, since student rocketry, drone, satellite, or human-powered vehicle teams provide the kind of applied experience that lectures cannot fully replicate and that admissions officers and employers both value. Finally, develop your coding skills, especially in MATLAB, Python, and increasingly C++, which are standard tools in modern aerospace work.

Computer Science

Despite computer science’s mainstream popularity, the major remains genuinely difficult, particularly at competitive universities. Beyond programming, students are expected to master algorithms, data structures, theory of computation, operating systems, and computer architecture. The mathematical content is heavier than many incoming students expect, and it’s often the part that determines who persists.

Difficulty varies significantly by institution and track. A computer science degree at a research-heavy school with a strong theory department looks very different from a more applied CS program, both are valuable, but they ask different things of students. Students who enter expecting a coding bootcamp experience are often surprised by how much of the degree is proof-based.

Stanford’s Computer Science curriculum begins with a strong foundation in programming and mathematics. First-year students typically complete CS 106A and CS 106B, which introduce programming methodology and abstractions, alongside calculus, linear algebra, and discrete mathematics through CS 103. Together, these courses build the technical and mathematical base for the major.

Sophomore year moves deeper into systems and theory, with courses such as CS 107 in computer organization and systems, CS 161 in algorithms, and CS 109 in probability for computer scientists. By junior year, Stanford’s breadth requirement becomes a defining part of the program, requiring students to study across areas such as systems, theory, artificial intelligence, and human-computer interaction. Popular upper-division courses include machine learning, databases, operating systems, and computer networking.

Senior year typically centers on advanced electives, research, or a substantial project. Students choose from tracks such as artificial intelligence, systems, theory, human-computer interaction, information, biocomputation, graphics, robotics, or an unspecialized path.

Topics that make computer science hard

Computer science becomes challenging when students move beyond basic coding and into the deeper topics that require abstract thinking, mathematical precision, and strong problem-solving skills.

• Discrete mathematics. Logic, sets, combinatorics, graph theory, the mathematical foundation of nearly everything else in the major.
• Algorithm design and complexity analysis. You learn not just how to write code but how to reason about whether your code will scale.
• Theory of computation. Includes automata, formal languages, and computability.
• Operating systems. Expose the often-uncomfortable reality of what’s happening below the abstractions most programmers work with.
• Computer architecture. Where the hardware-software boundary becomes the focus.

Many of these topics require a kind of abstract, proof-based thinking that is new to most students regardless of how much programming experience they bring in. Students who taught themselves to build web apps in high school are sometimes the most surprised when they hit a discrete math wall in their second semester.

Tips for succeeding in computer science

Strengthen your discrete math foundation early, since logic, proofs, sets, and combinatorics form the language behind algorithms and theory. AP Calculus can be helpful, but it is not the most important math preparation for computer science. You should also practice algorithmic problem-solving outside regular coursework, using platforms that build reasoning skills rather than just teaching syntax.

At the same time, do not confuse programming proficiency with full CS readiness. The two overlap, but the hardest parts of a CS degree are often conceptual, not syntactic, which means you can be a strong programmer and still struggle with areas like theory of computation. Finally, when possible, read your professors’ published papers. It is an underused way to understand what they care about intellectually and can make office hours much more productive.

Biochemistry

Biochemistry sits at the intersection of biology and chemistry, requiring students to master molecular biology, organic chemistry, metabolic pathways, and advanced laboratory techniques simultaneously.

The University of Pennsylvania’s Biochemistry curriculum draws on both the School of Arts and Sciences and Penn’s strong medical and biological research infrastructure. Students begin with a first-year foundation in general chemistry, calculus, biology, and Penn’s required writing seminar.

Sophomore year introduces organic chemistry, often one of the major’s key filtering courses, along with cell biology, genetics, and introductory biochemistry. Lab work also becomes more demanding and independent. By junior year, the program shifts into advanced biochemistry, with courses in physical chemistry, molecular biology, metabolism, macromolecular structure, and specialized electives in areas such as structural biology, chemical biology, and neuroscience.

Senior year is typically research-centered. Many students work in a lab, and honors students often complete a senior thesis. Final-year electives may focus on genomics, enzymology, pharmacology, or related areas, depending on whether students are preparing for medical school, graduate research, or careers in biotechnology and pharmaceuticals.

The major is unusually punishing because it demands two very different kinds of thinking. The biology side requires memorization of complex systems, enzyme cascades, signaling pathways, and metabolic cycles, at a level of detail that rivals medical school anatomy. The chemistry side, especially organic chemistry, requires mechanistic reasoning about how molecules transform. Students cannot rely on one strength to compensate for a weakness in the other.

Topics that make biochemistry hard

Biochemistry is challenging because it sits at the intersection of chemistry and biology, requiring students to understand both molecular detail and complex living systems.

• Organic chemistry. Widely cited as one of the hardest undergraduate courses in any major, and famous as a pre-med “weed-out” course with high withdrawal and failure rates.
• Molecular biology. Where the level of detail expected on exams is much higher than in introductory biology.
• Enzyme kinetics and biochemistry of metabolism. Require quantitative reasoning and memorization at once.
• Structural biology. Where 3D visualization of molecules becomes essential.
• Advanced laboratory techniques. Include spectroscopy, chromatography, and increasingly molecular biology methods.

What makes biochemistry distinctly hard is that it forces students to be simultaneously strong at the qualitative pattern-matching of biology and the quantitative reasoning of chemistry, a combination that few high school students have meaningfully practiced.

Tips for succeeding in biochemistry

Take AP Chemistry and AP Biology in high school if available, as both build the vocabulary and conceptual frameworks that biochemistry assumes early on. Use active recall and spaced repetition for memorization-heavy material; tools like Anki are popular among biochemistry and medical students for a reason. For metabolic pathways, pair studying with visual diagramming.

Drawing cycles by hand is often far more effective than simply rereading them in a textbook. Finally, try to join a biochemistry or molecular biology lab by your sophomore year, especially if you are considering graduate school, medical school, or a research-focused career. For more guidance, see our guide on the best pre-med colleges.

Mathematics

A pure or applied mathematics major involves some of the most abstract coursework in the undergraduate curriculum: real analysis, abstract algebra, topology, complex analysis, and differential equations. A single problem set in real analysis can require more cognitive effort than a week of work in a less abstract major.

There’s a sharp distinction between the procedural math most students encounter in high school and the proof-based reasoning that defines a college mathematics major. High school math, even AP Calculus, is largely about applying techniques to solve well-defined problems. College mathematics is about establishing whether a statement is true, in a way that admits no counterexamples, using only logically valid steps.

MIT’s mathematics department requires its majors to take a differential equations course, real analysis, two algebra courses, topology, an additional analysis subject, seminars, and several additional electives. Real analysis at MIT (subject 18.100) is described in the catalog as the course that introduces the rigorous construction and writing of proofs and it’s often the first place students discover whether they have the temperament for the major.

Topics that make mathematics hard

Some topics that can make college mathematics particularly hard are:

• The transition from computation to proof in real analysis. The single largest cognitive shift in the major.
• Abstract algebra. Where familiar operations like addition and multiplication are stripped down to their formal properties and generalized to groups, rings, and fields.
• Topology. Which asks students to reason rigorously about properties of spaces that resist visualization.
• Complex analysis. Where the elegant structure of complex-valued functions reveals deep connections between seemingly distant areas of math.
• Differential equations. Taught at a level that goes well beyond the cookbook techniques of an introductory class.

In most majors, you can struggle through a topic and still pass by getting partial credit on procedural steps. In a proof-based math class, a proof is either correct or it isn’t, and the student who writes a “mostly right” argument often gets fewer points than a student who clearly wrote nothing, because the wrong argument has to be carefully corrected.

Tips for succeeding in mathematics

Succeeding in mathematics takes more than memorizing formulas; it requires steady practice, strong problem-solving habits, and a clear understanding of core concepts.

Take a proof-writing or introduction-to-proofs course as early as possible, ideally in your first semester. Formal proof is the foundation of upper-division math, and the sooner you build that skill, the easier the major becomes. Work collaboratively, too. Explaining your reasoning out loud and testing ideas with classmates can sharpen your thinking far more than studying alone. Most successful math students do not rely on the lone-wolf approach.

Do not treat early struggle as a sign that you are not capable. The shift from computational math to abstract reasoning is difficult for nearly everyone, even students who excelled in high school. Many students describe their first proof-based course as the moment they realized math was much deeper than they expected, and that adjustment is normal.

Finally, talk to the faculty. Math departments are often smaller than students assume, and professors are usually willing to help students work through difficult proofs or ideas.

How to Decide if a Hard STEM Major Is Right for You

Difficulty alone is not a reason to avoid a major. The hardest STEM majors are also among the most rewarding intellectually and, in many cases, financially. BLS data shows engineering occupations as a whole pay a median wage roughly double that of all occupations. The right question isn’t “Is this major hard?” It’s “Is this major hard in a way that fits how I think and what I’m willing to invest?”

Here are some factors you can reflect on:

Assess your foundation in math and science

Take honest stock of your high school performance in math and science, particularly in courses that mirror early college STEM content: calculus, chemistry, biology, and physics. Strong performance in rigorous AP or IB formats is a meaningful signal of readiness. Students who found these courses genuinely engaging, not just achievable, tend to persist further than students who got through them by working harder.

Pay particular attention to whether you enjoyed the conceptually difficult parts or just survived them. Liking the puzzle of a hard chemistry problem is a much stronger signal than getting an A.

Consider your tolerance for abstraction and ambiguity

Many of the hardest STEM majors require comfort with abstract thinking and prolonged problem-solving where the answer isn’t immediately clear. Students who struggled with proof-based math or conceptual physics in high school may find certain STEM majors more frustrating than rewarding. That’s useful information rather than a verdict on ability, and there’s no shame in choosing a major that suits how you actually like to think.

If you’re naturally drawn to questions with concrete, applied answers, you may prefer a hands-on engineering discipline over pure physics or mathematics. If you love conceptual depth and don’t mind sitting with an unresolved problem for days, abstract math or theoretical physics may be exactly right.

Talk to current students and review course sequences

One of the most useful things a prospective student can do is talk to current undergraduates in their target major, ideally at schools they’re considering. Course catalog descriptions are written by departments;l, and honest workload assessments come from people in the middle of it.

Also, pull up the full four-year course sequence for any major you’re considering; almost every university publishes one publicly. The arc of required coursework reveals difficulty and pacing in ways that a glossy major description does not. A program that backloads its hardest classes into junior year tells you something different than one that runs at full intensity from sophomore fall.

For students still narrowing their list, our breakdowns on how to get into MIT, how to get into Caltech, and how to get into Stanford walk through what each of these STEM-heavy schools actually looks for in applicants.

Are You Considering a Hard STEM Major?

Strong applications to top STEM programs look very different from strong applications to liberal arts colleges. Chemical engineering programs want to see calculus, chemistry, and research; aerospace programs want physics and design teamwork; CS programs want demonstrated algorithmic thinking, not just side projects.

At AdmissionSight, we help students who have a specific STEM degree in mind build the strongest possible application profile for it, from selecting the right AP and IB courses to identifying extracurricular activities (such as research, competitions, clubs, independent projects) that signal genuine readiness and interest in that field. This guidance is tailored to the specific major you’re targeting, not generic admissions advice.

If you’d like to see where you currently stand, take a look at our Academic and Extracurricular Profile Evaluation or run our free Chances Calculator to get a baseline assessment.

Frequently Asked Questions

1. What is the hardest STEM major in college?

No single major is universally hardest, but chemical engineering, physics, and electrical engineering consistently appear at the top of difficulty rankings based on GPA distributions, weekly study hours, and student-reported workload.

Chemistry, mathematics, and biochemistry are close behind. Which one feels hardest to a given student depends on whether their weak spot is heavy math, abstract proof, lab-intensive work, or memorization load.

2. Are STEM majors hard for everyone, or does it depend on the student?

Both. STEM majors are objectively more demanding by most measurable indicators, lower average GPAs, higher weekly study hours, and higher attrition rates than most non-STEM fields. But within STEM, the relative difficulty of specific majors depends heavily on a student’s prior preparation and how they like to think.

3. Which hardest STEM majors have the best job prospects?

Engineering disciplines, particularly chemical, electrical, aerospace, and computer engineering, combine high difficulty with strong job markets. The Bureau of Labor Statistics Occupational Outlook Handbook projects faster-than-average growth and well-above-average wages for most engineering occupations through 2034.

Computer science also remains strong despite cyclical hiring shifts. Pure physics and mathematics majors often find work in finance, data science, and software, though many continue to graduate school first.

4. Can a student switch out of a hard STEM major if it becomes too difficult?

Yes, and it’s common. NCES data show that roughly 28% of STEM entrants switch to a non-STEM major before graduating. Most universities make it relatively easy to move from a harder STEM major into a related but less demanding one, for example, from chemical engineering into chemistry, or from electrical engineering into computer engineering or applied math.

5. How can high schoolers prepare for the hardest STEM majors before college?

Take the most rigorous math and science courses your school offers, like AP Calculus BC, AP Physics C, AP Chemistry, and AP Biology, which are the most relevant for the majors covered here. Beyond coursework, get involved in something that demonstrates sustained, self-directed work in a STEM area: research at a local university, a competitive science olympiad, a robotics team, or a meaningful independent project. Build comfort with programming, particularly Python. Also, read broadly in the field you think you want to study, so you arrive on campus with context that lectures can build on rather than introduce.

Takeaways

• STEM is genuinely harder by every measurable indicator. Lower average GPAs (chemistry around 2.78), higher weekly study loads (19+ hours for engineering majors), and nearly 50% attrition out of STEM bachelor’s programs, most of it in the first two years, aren’t a perception problem. The data backs up what students feel.
• The hardest majors share a common pattern: they demand multiple kinds of mastery at once. Chemical engineering combines advanced math and advanced science. Biochemistry combines memorization-heavy biology and quantitative chemistry. Mathematics combines abstract reasoning with rigorous formal proof. The students who struggle most are usually those who counted on one strength to compensate for a weakness elsewhere.
• Difficulty is personal. A student who thrives on abstract problem-solving may find pure math natural; the same student might find biochemistry’s memorization load draining. Choosing a major that matches how you actually like to think matters more than choosing the “right” hard major on a ranking.
• Preparation in high school is a big predictor of persistence. Strong AP performance in calculus, chemistry, physics, and biology, combined with research, competitions, or sustained independent projects, separates students who arrive ready from students who arrive scrambling.
• If you’re aiming at a specific hard STEM major, your application strategy needs to match it. Chemical engineering programs look for different signals than computer science programs; aerospace programs want different extracurriculars than biochemistry programs. AdmissionSight’s Private Consulting Program gives students one-on-one guidance tailored to the exact major they’re targeting, from course selection and extracurricular planning to essay strategy and school list building.