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MCAT practice test

Here are 20 free MCAT-style questions across all four sections: chemistry and physics, CARS, biology and biochemistry, and psychology and sociology. We wrote them ourselves, with four answer choices like the real exam. The MCAT has no pass mark, so aim for 70%, which is 14 right. That’s our practice target, not an AAMC rule. You’ll see why each answer is right, and anything you miss comes back at the end.

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Updated October 2026 · Written from official sources, listed at the bottom of this page

Question 1 of 20

A buffer is made with equal concentrations of acetic acid (pKa = 4.76) and sodium acetate. What is the pH of the buffer?

Sample of the MCAT: same format, 20 questions.

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OverviewMCATHow many questionsHow many questions are on the MCAT?Score rangeMCAT score range: highest, lowest and how scoring worksRegister and test datesHow to register for the MCAT, and the 2027 test datesCostHow much does the MCAT cost?Online testCan you take the MCAT online?Percentiles and averageMCAT percentiles: what your score meansScore releaseWhen do MCAT scores come out?Format and lengthHow long is the MCAT? Sections in order, timing and breaksSubjects and topicsWhat subjects are on the MCAT?Test day and locationsMCAT test day: test centers, check-in and the rulesAccommodationsMCAT accommodations: extra time, breaks and how to applyRetakeCan you retake the MCAT?Official study guideWhat’s on the MCAT: the official AAMC outline and practiceWhere to learnWhere to study for the MCATStudy plannerMCAT study planner
Sources: AAMC and 2 more. Checked October 2026.

Rules and fees can change, so check the official site before your test.