In terms of science, the MCAT tests biochemistry, biology, chemistry (general chemistry and organic chemistry), physics, psychology, and sociology in three sections: 1. Chemical and Physical Foundations of Biological Systems 2. Biological and Biochemical Foundations of Living Systems 3. Psychological, Sociological, and Biological Foundations of Behavior There's a fourth section, as well, Critical Analysis and Reasoning Skills (CARS—think of it like verbal reasoning/critical thinking). For more on what each section contains, check out our MCAT topics PDF!