Unofficial guide · not affiliated with the AAMC, NBME, USMLE, LCME, or NRMP Part of the SI MedEd family · SI MedEd portal →
M SI MedSchool
One hub for everyone

Preparing for the MCAT.

General guidance on the Medical College Admission Test: what it covers, how it's scored, how long to study, and how to structure your preparation. No test content is reproduced here — the AAMC's official materials are the authoritative source.

What the MCAT is

The Medical College Admission Test is the standardized exam required by virtually all U.S. medical schools. It's a computer-based, full-day exam — roughly seven and a half hours including breaks — that assesses the foundational science knowledge and reasoning skills medical schools expect of incoming students: biology, biochemistry, general and organic chemistry, physics, psychology, and sociology, plus the ability to reason critically about complex texts.

The exam has four scored sections:

  • Biological and Biochemical Foundations of Living Systems — biology and biochemistry, with general and organic chemistry woven in.
  • Chemical and Physical Foundations of Biological Systems — general and organic chemistry, physics, biochemistry.
  • Psychological, Social, and Biological Foundations of Behavior — psychology and sociology applied to health and behavior.
  • Critical Analysis and Reasoning Skills (CARS) — humanities and social-sciences passages; no outside science knowledge required, just careful reading and reasoning.

Each section is scored from 118 to 132, for a total range of 472 to 528, centered at 500. Schools publish their entering classes' median scores through the AAMC's MSAR — the most useful benchmark for comparing your score to a school's typical range. For full scoring details, see the AAMC's official MCAT resources (linked on our Resources page).

How long to study

Most students prepare for roughly three to five months, studying part-time alongside classes or full-time over a summer. The right length depends on where you're starting: a strong science background shortens the runway; a career changer rebuilding prerequisites needs a longer one. The usual advice is to start only when you can study consistently — sporadic, guilt-ridden studying over eight months rarely beats focused work over three.

A common structure: finish your prerequisite coursework first (many students take the MCAT after biochemistry), take a diagnostic practice exam early so you know your weak spots, then schedule the exam itself at a point when your practice scores are where your schools need them to be.

Prep principles that actually work

Whatever resources you choose, effective MCAT preparation follows the same pattern:

  • Content review first. Rebuild the science foundations — the equations, pathways, and concepts. But content review alone doesn't raise scores past a point; it's the price of entry, not the whole strategy.
  • Passage-based practice. The MCAT tests science the way it tests reading: through long passages with data to interpret. Practicing passages — not just standalone facts — is how you train for the real thing.
  • Full-length practice exams under timed conditions. Stamina matters on a seven-and-a-half-hour test, and your practice scores are your best predictor of test day. Take them timed, review every wrong answer, and log why you missed each one.
  • CARS gets its own training. Critical Analysis and Reasoning Skills rewards a different skill — close reading under time pressure — and it improves slowly. Start early, read daily, and don't cram it.
  • Review misses by category. Was it a knowledge gap, a passage misread, a math error, or a time-management collapse? Different causes need different fixes.

Where to start: the AAMC itself. The AAMC writes the test and publishes official practice materials — including full-length official practice exams and the complete content outline — at students-residents.aamc.org/mcat. Whatever else you use, official materials should be the backbone of your preparation. This guide names and endorses no commercial prep company.

Retakes

You can retake the MCAT — many students do — but plan as if you'll only take it once. Schools see all your scores, and while many schools consider your highest or most recent score, a lower retake can raise questions. A retake makes sense when you can point to something concrete that will change: more study time, a finished biochemistry course, a real prep plan where you previously had none.