MCAT Unit Tests

About the MCAT exam

The MCAT (Medical College Admission Test), administered by the AAMC, is a standardized, computer-based exam required by nearly all U.S. and Canadian medical schools. It assesses not just content knowledge but the scientific reasoning, data interpretation, and critical analysis skills medical schools deem essential. The exam has four sections. Chemical and Physical Foundations of Biological Systems draws on general chemistry, physics, organic chemistry, and biochemistry as they apply to living systems. Critical Analysis and Reasoning Skills (CARS) is unique: it contains no outside content and instead tests reading comprehension and argument analysis across humanities and social science passages. Biological and Biochemical Foundations of Living Systems centers on biology and biochemistry with supporting chemistry, and Psychological, Social, and Biological Foundations of Behavior covers psychology, sociology, and biology. Most questions are passage-based, requiring students to integrate provided experimental data, figures, and research findings with prior knowledge rather than simply recall facts. The full exam comprises 230 questions and runs 6 hours and 15 minutes of testing time, with total seated time near 7.5 hours including breaks, making endurance a genuine factor. Students most often underestimate CARS, which cannot be crammed and rewards sustained practice, and they struggle to balance the enormous content breadth of biochemistry and psychology/sociology against deep reasoning demands. Stamina, timing, and data-figure interpretation under fatigue are recurring challenges. Effective preparation combines long-horizon content review with full-length AAMC practice exams taken under realistic timing to build both knowledge and test-day endurance.