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Free Full-Length MCAT Practice Test

A complete MCAT at real length and timing: all four sections, 230 original questions, passage sets and stand-alone questions, four answer choices, and an explanation for every answer.

1practice test230scored questions6 hr 15 min total4sections
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What this practice test covers

MCAT Practice Test 1 is full-length: the same four sections, in the same order, with the same question counts and time limits as AAMC's exam:

SectionQuestionsTime
Chemical and Physical Foundations of Biological Systems5995 min
Critical Analysis and Reasoning Skills5390 min
Biological and Biochemical Foundations of Living Systems5995 min
Psychological, Social, and Biological Foundations of Behavior5995 min
Total2306 hr 15 min

Each science section has 10 passage sets (4–6 questions each, many built around experiments with data) plus 15 stand-alone questions, as the real exam does. CARS has nine original 500–600-word passages from the humanities and social sciences, with 5–7 questions each. Every question is original and comes with an explanation of why the right answer is right and why the most tempting wrong answer is wrong.

Breaks: there's no break timer, but each section's clock starts only when you select Start on the screen between sections, so you can take the real exam's optional breaks yourself—up to 10 minutes after Chem/Phys, 30 after CARS, and 10 after Bio/Biochem.

How to use it

  • Exam mode times each section and reveals answers only at the end. That's test-day pacing: about 1.6 minutes per science question and 1.7 minutes per CARS question.
  • Practice mode is untimed by default and lets you check each answer as you go. Use it when you're learning a topic and want the explanation right away.
  • Treat it as a dress rehearsal. Start in the morning, keep the real order and break lengths, and see where your focus fades. Stamina is part of the test.
  • Can't do it in one sitting? Progress saves in your browser, so you can stop between sections and finish later—though a split day is easier than the real thing.
  • Do the math by hand. This practice test has no calculator, and fast estimation is worth building. AAMC gives you a periodic table in the Chem/Phys and Bio/Biochem sections on the real exam, so an excerpt is under the Reference button here.

How the real MCAT is scored

The real exam reports a scaled score from 118 to 132 for each section, added into a total from 472 to 528. AAMC converts raw scores to scaled scores through equating, which compensates for small differences in difficulty between test forms; the exam isn't curved, and there's no penalty for wrong or unanswered questions. There's no fixed public conversion table.

So this practice test reports percent correct, overall and by AAMC foundational concept (science sections) or CARS skill. That breakdown tells you where to study next. Even at full length, it can't tell you what you'd score on test day: these are original questions, not an equated AAMC form, so any conversion to the 472–528 scale would be a guess.

What to do after you finish

  1. Review every question, not just misses. Budget at least as long for review as the test took. For each question, write down why the right answer is right. Lucky guesses count as misses.
  2. Tag each miss: content gap, misread passage or graph, calculation slip, or fell for a trap. Each needs a different fix.
  3. Go back to the content. Use the Bio/Biochem guide for biology and biochemistry misses and the CARS guide for reading misses.
  4. Graduate to official full-lengths. Once you've built content, AAMC's practice exams are the closest thing to test day.

Official MCAT practice from AAMC

AAMC's own materials use questions from previously administered MCAT exams, so they're the benchmark:

  • Unscored Sample Test — free, full-length (230 questions), with video walkthroughs for four CARS passage sets.
  • Practice Exam 1 — free, full-length.
  • Practice Exams 2–6, the Section Bank (Volumes 1 and 2), the question packs, and the Independent Question Bank — low-cost.

If you're approved for AAMC's Fee Assistance Program, all online MCAT Official Prep products are included. See AAMC's official prep page for current details, and our MCAT prep books page for how they compare with commercial options.

Sample questions

5 questions from this practice test, with answers and explanations. Take the full test above for timing, scoring and your weakest domains.

Sample question 1Foundational Concept 5: Chemical principlesMedium

What is the approximate net charge of the tetrapeptide Asp-His-Glu-Ala at pH 7.4?

  1. A. −3
  2. B. −2
  3. C. −1
  4. D. +1
Show answerHide answer
Correct answerB. −2

−2. At pH 7.4: the N-terminal amino group (pKa ≈ 9) is protonated, +1; the C-terminal carboxyl (pKa ≈ 2) is deprotonated, −1; Asp and Glu side chains (pKa ≈ 4) are each −1; Ala's side chain is uncharged; and the His side chain (pKa ≈ 6.0) is mostly neutral because pH is well above its pKa. Total: +1 − 1 − 1 − 1 = −2.

−1 is the answer you get if you count histidine as positive. It is protonated only below about pH 6, so at physiological pH only a few percent of His side chains carry a charge.

Sample question 2Foundational Concept 4: Physical principlesMedium

Inspired air becomes saturated with water vapor, with a partial pressure of 47 mmHg at body temperature, as it passes through the upper airway. If barometric pressure is 760 mmHg and O2 makes up 21% of dry air, what is the partial pressure of O2 in the humidified air in the trachea?

  1. A. 150 mmHg
  2. B. 160 mmHg
  3. C. 713 mmHg
  4. D. 760 mmHg
Show answerHide answer
Correct answerA. 150 mmHg

≈150 mmHg. Water vapor takes up 47 mmHg of the total pressure, leaving 760 − 47 = 713 mmHg for the dry gases. O2 is 21% of those: 0.21 × 713 ≈ 150 mmHg.

160 mmHg (0.21 × 760) is the PO2 of dry air. It ignores the dilution by water vapor, which is the whole point of Dalton's law here. 713 mmHg is the total dry-gas pressure, not the O2 share.

Sample question 3Foundational Concept 2: Cells and organismsHard

In a primary spermatocyte, the two homologs of one chromosome pair fail to separate during meiosis I. Meiosis II then proceeds normally. What fraction of the resulting sperm cells will have an abnormal number of that chromosome?

  1. A. 0
  2. B. 1/4
  3. C. 1/2
  4. D. All of them
Show answerHide answer
Correct answerD. All of them

When homologs fail to separate in meiosis I, one secondary spermatocyte gets both homologs and the other gets neither. After a normal meiosis II, the first cell yields two sperm with an extra copy (n + 1) and the second yields two sperm missing the chromosome (n − 1). All four are aneuploid.

1/2 is the answer for nondisjunction in meiosis II in one of the two secondary spermatocytes: that cell makes one n + 1 and one n − 1 sperm, while the other cell makes two normal sperm.

Sample question 4Foundational Concept 3: Organ systemsMedium

In a skeletal muscle fiber, which event directly allows myosin heads to bind to actin?

  1. A. Ca2+ binding to troponin, which shifts tropomyosin away from the myosin-binding sites on actin
  2. B. ATP binding to the myosin head
  3. C. Acetylcholine binding to receptors on the sarcoplasmic reticulum membrane
  4. D. Ca2+ binding to calmodulin, which activates myosin light-chain kinase
Show answerHide answer
Correct answerA. Ca2+ binding to troponin, which shifts tropomyosin away from the myosin-binding sites on actin

At rest, tropomyosin covers the myosin-binding sites on thin filaments. When Ca2+ released from the sarcoplasmic reticulum binds troponin C, the troponin–tropomyosin complex shifts and exposes those sites, so cross-bridges can form.

ATP binding actually releases myosin from actin. Acetylcholine acts at the motor end plate on the sarcolemma, not the SR. The calmodulin/myosin light-chain kinase pathway is how smooth muscle is regulated—a favorite distractor.

Sample question 5Foundational Concept 7: BehaviorMedium

Before deliberating, each juror in a civil case leans slightly toward awarding the plaintiff a large sum. After discussing the case together, the jury awards an even larger amount than any juror initially favored. This outcome best illustrates:

  1. A. groupthink
  2. B. social facilitation
  3. C. deindividuation
  4. D. group polarization
Show answerHide answer
Correct answerD. group polarization

Group polarization is the tendency for group discussion to push members toward a more extreme version of the position they already leaned toward.

Groupthink is the most common wrong pick: it involves suppressing dissent to preserve harmony, often producing poor decisions, but it doesn't specifically predict a shift toward the extreme of an initial leaning. Social facilitation is better performance on simple tasks in front of others. Deindividuation is loss of self-awareness in groups.

More MCAT guides

Overview

MCAT Guide 2026–27

The MCAT is the 7½-hour, 230-question standardized exam for medical school admissions.

Read Book picks

Best MCAT Prep Books and Materials (2026–27)

For the MCAT, the most important prep materials aren’t books at all. They’re AAMC’s online practice products.

Read Guide

MCAT Biology & Biochemistry Guide

Bio/Biochem is the section where content knowledge and passage reasoning collide.

Read Guide

MCAT CARS Guide: How to Read Faster and Miss Less

CARS has no content to memorize, which is exactly why it scares people.

Read

Frequently asked questions

Is this MCAT practice test really free?

Yes. No account or payment. Your progress saves in your browser so you can come back to it.

How long does this practice test take?

6 hours 15 minutes of testing in exam mode, plus whatever breaks you take between sections.

Is it the same length as the real MCAT?

Yes, for the scored part: 230 questions with the same per-section counts and time limits as AAMC's exam. Test day adds a certification step, an optional tutorial, optional breaks, a void question, and an optional survey, for about 7½ hours of seated time.

Are these real MCAT questions?

No. They're original questions written to match the MCAT's format, difficulty, and content outline. For questions from past MCAT administrations, use AAMC's official products.

Can I convert my percent correct to an MCAT score?

Not reliably. The MCAT's scaled scores depend on the specific test form, and AAMC doesn't publish a raw-to-scaled table. Use your results to find weak areas.

Sources & official links