The MCAT has four sections, totaling 230 multiple-choice questions across 6 hours and 15 minutes of testing time. When you factor in breaks and check-in procedures, the total seated time stretches to about 7 hours and 27 minutes. Each section is scored individually on a scale of 118 to 132, and those four scores combine into a total score ranging from 472 to 528.
The Four Sections in Order
The sections always appear in the same sequence on test day:
- Chemical and Physical Foundations of Biological Systems (often called “Chem/Phys”): 59 questions, 95 minutes
- Critical Analysis and Reasoning Skills (CARS): 53 questions, 90 minutes
- Biological and Biochemical Foundations of Living Systems (often called “Bio/Biochem”): 59 questions, 95 minutes
- Psychological, Social, and Biological Foundations of Behavior (often called “Psych/Soc”): 59 questions, 95 minutes
Between these sections, you get two optional 10-minute breaks and one 30-minute mid-exam break (essentially a lunch break between sections two and three). Each section also includes a small number of unscored “field test” questions mixed in with the real ones. You won’t know which questions are experimental, so you need to treat every question as if it counts.
Chem/Phys: What It Covers
The first section tests your ability to apply science concepts to biological and medical scenarios. The subject breakdown is roughly 30% general chemistry, 25% introductory physics, 25% first-semester biochemistry, 15% organic chemistry, and 5% introductory biology. Of the 59 questions, 44 are tied to reading passages (10 passage sets with 4 to 6 questions each) and 15 are standalone “discrete” questions that don’t reference a passage. You have about 1 minute and 36 seconds per question, but in practice you’ll spend chunks of that time reading passages before answering the associated questions.
CARS: The Reading-Heavy Section
CARS is the only section that doesn’t test science knowledge at all. Instead, you read nine passages drawn equally from the humanities (ethics, philosophy, arts) and the social sciences (economics, political science, psychology), then answer 5 to 7 questions per passage. Every answer can be found within the passage itself, so no outside coursework is required. That said, the reading style is deliberately different from textbook reading. Passages are dense, often argumentative, and the questions ask you to identify underlying assumptions, evaluate reasoning, and draw inferences rather than recall facts.
With 53 questions in 90 minutes, you get about 10 minutes per passage and its question set. Many test-takers find CARS the hardest section to improve on quickly because it rewards years of close reading habits more than last-minute cramming.
Bio/Biochem: The Most Biology-Dense Section
This section leans heavily into introductory biology, which makes up about 65% of its content. First-semester biochemistry accounts for another 25%, with general chemistry and organic chemistry each contributing roughly 5%. The format mirrors Chem/Phys: 10 passage-based question sets plus 15 discrete questions, all in 95 minutes. Topics span molecular biology, cell biology, organ systems, genetics, and metabolism. If you’ve taken a standard pre-med course sequence, this section draws most directly from your biology and biochemistry classes.
Psych/Soc: Behavior and Society
The final section covers psychology, sociology, and biology as they relate to human behavior and health outcomes. It uses the same 10-passage-plus-15-discrete format as the other science sections, with 59 questions in 95 minutes. Content includes topics like learning and memory, social stratification, identity formation, perception, and how demographic factors influence health. Many students underestimate this section because the material can feel more intuitive than organic chemistry, but it has its own dense vocabulary of theories and concepts that require dedicated study.
How Scoring Works
Each section is scored from 118 to 132, with 125 as the midpoint. The four section scores add up to a total between 472 and 528, with 500 as the midpoint. That midpoint of 500 represents the 50th percentile, meaning half of test-takers score above it and half below. Scores for each section are reported separately on your score report, so medical schools can see how you performed on each one individually. A significant imbalance between sections (for example, a very low CARS score alongside high science scores) can raise flags during admissions review even if your total looks competitive.
Managing 7+ Hours on Test Day
You need to arrive at least 30 minutes before your scheduled start for check-in, identity verification, and a brief tutorial. From there, the day follows a fixed rhythm: Chem/Phys, optional 10-minute break, CARS, 30-minute mid-exam break, Bio/Biochem, optional 10-minute break, Psych/Soc. The two short breaks are optional but worth taking. Standing up, stretching, and eating a snack can help reset your focus for the next 90 to 95 minutes of concentration.
Pacing is one of the biggest challenges. In the science sections, spending too long on a difficult passage can cost you easy points at the end. Many high scorers practice strict timing during their prep: roughly 8 to 9 minutes per passage set in the science sections, with the remaining time allocated to discrete questions. For CARS, 10 minutes per passage is the standard target, leaving almost no buffer.