The Biological Sciences section of the MCAT may cover topics in molecular biology, microbiology, cellular biology, anatomical systems, genetics and evolution. Most medical schools require at least one year of biology with lab.
Candidates for the MCAT should complete one year of general or inorganic chemistry and one year of organic chemistry before sitting for the exam. Each chemistry class must include or be accompanied by a laboratory course. Questions and problems on the MCAT concerning chemistry should cover the periodic table, bonding, phases of matter and acids and bases.
Calculus is generally required to take physics and most medical schools require at least one year of calculus for admission, so it's a good idea to take calculus early on in your program of study. Physics appears on the MCAT in the Physical Sciences section and may test your knowledge in thermodynamics, magnetism, light, optics, nuclear physics, Newtonian physics and atomic phenomenon.
Though not required, you may want to consider taking additional classes in biochemistry, genetics and analytical chemistry to do well on the exam.