The Complete MCAT Exam Guide

Section 1: Biological & Biochemical Foundations of Living Systems

The Biological & Biochemical Foundations section is 95 minutes with 59 questions — 10 passage-based sets plus 15 discrete stand-alone questions. Commonly called the "Biology section," it tests your ability to apply biology and biochemistry to the physiological and molecular scenarios that mirror real medical practice.

High-yield topics include molecular biology (DNA replication, transcription, translation), cell biology, genetics, enzyme kinetics, metabolism, and the physiology of major organ systems — cardiovascular, respiratory, digestive, nervous, immune, and musculoskeletal. Full section breakdown and study strategies →

Section 2: Critical Analysis & Reasoning Skills (CARS)

The CARS section is 90 minutes with 53 questions across 9 passages drawn from the humanities and social sciences — ethics, philosophy, history, literary criticism, and cultural studies. It is the only MCAT section where scientific knowledge is completely irrelevant: every answer is grounded in the passage itself.

Questions test your ability to identify central arguments, evaluate evidence and assumptions, detect logical gaps, and apply passage reasoning to new scenarios — all under tight time pressure averaging under two minutes per question.

CARS is the hardest section to improve quickly, especially for science-focused students. Real gains come from weeks of structured active reading practice — not last-minute cramming. Full section breakdown and strategies →

Section 3: Psychological, Social & Biological Foundations of Behavior

The Psych/Soc section is 95 minutes with 59 questions. Added in 2015, it reflects medicine’s emphasis on understanding the behavioral and social forces that shape patient health — not just the biology.

Psychology topics include perception, cognition, learning, memory, motivation, emotion, personality, and psychological disorders. Sociology covers health disparities, social stratification, discrimination, and identity. The neuroscience of behavior — stress responses, the endocrine system, sensation and perception — ties them together. Research methods and statistics are tested throughout.

Don’t be fooled by the label. This section covers a massive volume of testable concepts, and students who underestimate it consistently pay for it on test day. Full section breakdown and study tips →

Section 4: Chemical & Physical Foundations of Biological Systems

The Chem/Phys section is 95 minutes with 59 questions — and it is the very first section you face on test day. It evaluates your mastery of the physical and chemical principles underlying biological processes: the scientific foundation of pharmacology, physiology, and clinical medicine.

High-yield topics include thermodynamics, reaction kinetics, electrochemistry, acid–base chemistry, fluid mechanics, optics, and atomic structure. Every question frames these in a biological context — you are never solving abstract textbook problems. Strong quantitative reasoning and fluency with unit analysis are essential for maintaining pace.

Students who approach this like a standard physics or chemistry course consistently underperform. The key is understanding why each principle matters in a living system. Full section breakdown and study tips →