MCAT Sections Explained: Order, Timing, Content and Scoring

Every examinee takes the four MCAT sections in the same sequence. According to the AAMC What's on the MCAT Exam page for the 2027 testing year, your day starts with a 4-minute test-day certification and a 10-minute tutorial, then moves through the four sections with scheduled breaks in between (all breaks, the tutorial and the 5-minute end-of-day survey are optional, and a 3-minute void question follows Section 4). Total content time is 6 hours and 15 minutes, and total seated time is about 7 hours and 30 minutes, not counting check-in when you arrive at the Pearson testing center. For a full walkthrough of check-in and break strategy, see our guide on how long the MCAT is.

By our calculation from the exam overview, the four sections total 230 multiple-choice questions: 185 passage-based questions across 39 passage sets and 45 independent questions (15 in each of the three science sections and none in CARS). On average, that gives you about 97 seconds per question in the three 95-minute science sections and about 102 seconds per question in the 90-minute CARS section.

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The first section of the day has 59 multiple-choice questions in 95 minutes (10 passage sets of 4 to 6 questions and 15 independent questions), with on-screen access to the periodic table. According to the What's on the MCAT Exam content outline (20-002D, 10/20), this section tests the mechanical, physical and biochemical functions of human tissues, organs and organ systems. Rather than testing physics or chemistry in isolation, it asks you to apply chemical and physical principles to living systems, such as fluid dynamics in blood circulation or electrical circuits in neuron signaling.

Question percentages are approximated to the nearest 5% and vary across test forms because of passage groupings, difficulty control and unscored field-test questions. Across the 59 questions, the approximate discipline distribution is 30% general chemistry, 25% first-semester biochemistry, 25% introductory physics, 15% organic chemistry and 5% introductory biology. If you are still planning your college schedule around these subjects, check our guide to the required classes for medical school.

Three sample questions from the content outline show how these subjects are tested in biological contexts. A Skill 1 question (Category 5D) asks what functional group forms when aspartic acid reacts with another amino acid to form a peptide bond: an amide group. A Skill 2 question (Category 4B) gives the radius of the aorta as about 1.0 cm with blood velocity of 30 cm/s, and a capillary radius of about 4 × 10, 4 cm with blood velocity of 5 × 10, 2 cm/s. Dividing the aortic volume flow rate by a single capillary's flow rate gives about 4 × 109 capillaries. A Skill 3 question (Category 5B) describes a urine protein precipitation test complicated by false-positive calcium phosphate precipitation, which you prevent by adding a buffer to maintain neutral pH.

• Foundational Concept 4 (40%): physical principles in living organisms. It covers Category 4A (translational motion, forces, work, energy and equilibrium), Category 4B (fluids for blood circulation and gas exchange), Category 4C (electrochemistry and electrical circuits), Category 4D (light and sound interaction with matter) and Category 4E (atoms, nuclear decay, electronic structure and atomic chemical behavior).
• Foundational Concept 5 (60%): chemical interactions and molecular dynamics. It covers Category 5A (water and solutions), Category 5B (molecules and intermolecular interactions), Category 5C (separation and purification methods), Category 5D (structure, function and reactivity of biologically relevant molecules) and Category 5E (chemical thermodynamics and kinetics).

After a 10-minute break, you take Critical Analysis and Reasoning Skills (CARS), which has 53 questions in 90 minutes across 9 passage sets of 5 to 7 questions, with no independent questions. Each passage is typically 500 to 600 words long and is excerpted from books, journals or magazines. Everything you need to answer the questions is in the passages and questions themselves, and no additional coursework or specific outside content knowledge is required.

Passages are split 50% humanities and 50% social sciences. Social sciences passages tend to be more factual and scientific in tone, while humanities passages are more likely to be conversational or opinionated and focus on relationships between ideas.

CARS questions fall into three analytical skill categories. Foundations of Comprehension (30%, about 16 of 53 questions by our calculation) asks you to understand the basic components of the text and infer meaning from immediate sentence context. You identify the author's thesis, passage structure, tone, word choice and rhetorical labels like 'for example' or 'consequently.' Reasoning Within the Text (30%, about 16 questions) asks you to connect distant parts of the passage to infer the author's purpose, position, assumptions or bias. You also separate the author's view from quoted sources and check whether claims are supported by evidence without bringing in outside opinions. Reasoning Beyond the Text (40%, about 21 questions) asks you to apply passage ideas to a new situation or analogy. Or it asks how introducing a new hypothetical condition would support, contradict or modify the author's argument.

• Humanities passages (50%): architecture, art, dance, ethics, literature, music, philosophy, popular culture, religion, theater and studies of diverse cultures.
• Social sciences passages (50%): anthropology, archaeology, economics, education, geography, history, linguistics, political science, population health, psychology, sociology and studies of diverse cultures.

Following the 30-minute mid-exam break, you take Biological and Biochemical Foundations of Living Systems: 59 questions in 95 minutes (10 passage sets of 4 to 6 questions and 15 independent questions), with access to the on-screen periodic table.

This section tests processes unique to living organisms, such as growing, reproducing, maintaining homeostasis, acquiring energy and adapting, as well as how cells and organ systems act independently and in concert. Across the 59 questions, the approximate discipline distribution is 65% introductory biology, 25% first-semester biochemistry, 5% general chemistry and 5% organic chemistry.

Two sample questions show how experimental methods and data interpretation appear in this section. A Skill 3 question (Category 1A) notes that sodium dodecyl sulfate (SDS) has a 12-carbon tail attached to a sulfate group and binds exposed hydrophobic regions of denatured proteins during gel electrophoresis. Because SDS coats denatured proteins with uniform negative charge and eliminates shape differences, the gel separates proteins by molecular weight. A Skill 4 question (Category 1A) shows three hemoglobin oxygen-binding curves at pH 7.2, pH 7.4 and pH 7.6. Comparing the curves shows that low pH favors the low-affinity oxygen-binding state.

• Foundational Concept 1 (55%): properties of biomolecules in cellular structure, genetics and metabolism. It covers Category 1A (proteins, amino acids, enzyme catalysis and Michaelis-Menten kinetics), Category 1B (DNA replication, transcription, translation, operons, eukaryotic gene regulation and recombinant DNA biotechnology), Category 1C (Mendelian inheritance, meiosis, mutation, Hardy-Weinberg and evolution) and Category 1D (bioenergetics, ATP hydrolysis, glycolysis, gluconeogenesis, pentose phosphate pathway, citric acid cycle, fatty acid oxidation and oxidative phosphorylation).
• Foundational Concept 2 (20%): assemblies of molecules, cells and organs. It covers Category 2A (plasma membrane, osmosis, active and passive transport, organelles, cytoskeleton and intercellular junctions), Category 2B (prokaryotes, bacterial transformation, conjugation and transduction, and viral life cycles) and Category 2C (mitosis, cell cycle control, gametogenesis and embryogenesis).
• Foundational Concept 3 (25%): tissue and organ systems maintaining homeostasis. It covers Category 3A (nervous and endocrine systems, action potentials, synaptic transmission, gated ion channels, GPCRs and hormone feedback loops) and Category 3B (respiratory, circulatory, lymphatic, immune, digestive, excretory, reproductive, muscle, skeletal and skin systems).

After the second 10-minute break, you finish with Psychological, Social, and Biological Foundations of Behavior: 59 questions in 95 minutes (10 passage sets of 4 to 6 questions and 15 independent questions), with the periodic table provided.

This section tests how psychological, social and biological factors influence perceptions, behavior, identity, cultural differences and social stratification. Across the 59 questions, the approximate discipline distribution is 65% introductory psychology, 30% introductory sociology and 5% introductory biology, plus about 5% psychology questions that are biologically relevant.

Four sample questions illustrate how each reasoning skill works here. A Skill 1 question (Category 7C) describes placing lemon juice on a tongue across repeated trials as salivation declines before switching to lime juice, which tests habituation and dishabituation. A Skill 2 question (Category 10A) asks you to predict from cultural capital that cultural distinctions of elite classes will be more valued in a society. A Skill 3 question (Category 7B) tests social loafing by having participants prepare a report or tax return alone or in a group. The independent variable is working alone or in a group, and the dependent variable is each participant's contribution. A Skill 4 question (Category 7B) shows that the bystander effect is supported when the number of bystanders is positively correlated with the time it takes to offer help.

• Foundational Concept 6 (25%): perceiving, thinking about and reacting to the world. It covers Category 6A (sensation, Weber's law, signal detection theory, vision, hearing, somatosensation and Gestalt perception), Category 6B (attention, Piaget's stages, heuristics and biases, sleep stages, memory and language brain areas) and Category 6C (James-Lange, Cannon-Bard and Schachter-Singer theories of emotion, the limbic system and stress appraisal).
• Foundational Concept 7 (35%): behavior and behavior change. It covers Category 7A (nervous and endocrine bases of behavior, personality theories, psychological disorders, motivation and cognitive dissonance), Category 7B (social facilitation, deindividuation, bystander effect, social loafing, conformity, obedience, group polarization, groupthink, deviance and socialization) and Category 7C (habituation, classical and operant conditioning, reinforcement schedules, observational learning, mirror neurons and the elaboration likelihood model).
• Foundational Concept 8 (20%): self-identity, social thinking and social interactions. It covers Category 8A (self-esteem, self-efficacy, locus of control, looking-glass self and identity development), Category 8B (fundamental attribution error, prejudice, stereotypes, stigma, ethnocentrism vs. cultural relativism, self-fulfilling prophecy and stereotype threat) and Category 8C (status, role conflict and strain, primary and secondary groups, bureaucracy, dramaturgical front-stage vs. back-stage self, altruism and institutional vs. individual discrimination).
• Foundational Concept 9 (15%) and Concept 10 (5%): social structure, demographics and stratification. They cover Category 9A (functionalism, conflict theory, symbolic interactionism, social constructionism, hidden curriculum, family, religion, medicalization, the sick role and social epidemiology), Category 9B (age cohorts, sex vs. gender, racialization, demographic transition, fertility, mortality, migration, globalization and gentrification) and Category 10A (spatial inequality, residential segregation, environmental justice, socioeconomic status, cultural and social capital, social reproduction, intersectionality, social mobility, relative and absolute poverty, and health and healthcare disparities).

Your MCAT score report gives you five scores: four individual section scores and one total score. According to the How is the MCAT Exam Scored page, the scoring process follows three steps.

First, your raw score counts the number of questions you answered correctly in each section. Wrong answers are scored the exact same way as unanswered questions, with no additional penalty for guessing, so you should answer every question before time expires.

Second, your number-correct raw score in each section is converted through a process called equating into a scaled score on a 15-point scale ranging from 118 (lowest) to 132 (highest). As an illustration from the scoring page, a raw score between 35 and 37 correct on a section might convert to a 123, while 46 to 48 correct might convert to a 128, depending on the specific test form.

Third, your four scaled section scores are added together to produce a total scaled score ranging from 472 (lowest) to 528 (highest). To see how admissions committees read those numbers, read our guide to what a good MCAT score is.

The MCAT is not graded on a curve. Your score does not depend on who else tested on your day or what month you took the exam. Instead, scaling and equating adjust for small variations in difficulty across different test forms so that a 124 on one form carries the same meaning as a 124 on any other form. Scaling, equating and reviewing examinee feedback take 30 to 35 days, and official scores are released by 5:00 p.m. ET on the scheduled release date. Your score report also includes confidence bands, score profiles and percentile ranks, which are updated every year on May 1 using data from the most recent three years. Read our AAMC AMCAS application guide when preparing your primary file.

Practice interview question on changing your MCAT study plan: Tell me about a time when you had to change how you prepared or studied after your first approach was not working.

• medical school interview questions

• AAMC: What's on the MCAT Exam? (Testing Year 2027)
• AAMC: What's on the MCAT Exam? Content Outline (PDF)
• AAMC: How is the MCAT Exam Scored?
• AAMC: Your Questions Answered: The MCAT Scoring Process
• AAMC: Understanding Your MCAT Score Report
• AAMC: U.S. MCAT Calendar, Scheduling Deadlines, and Score Release Dates (2027)