Physical Sciences: This is 70 minutes (52 questions) of reading and analyzing scientific questions related to general chemistry and physics. Preparation for this section involves one year each of general chemistry and physics. These are all multiple-choice questions. This is scored from 1 to 15.
Biological Sciences: This is 70 (52 questions) minutes of reading and analyzing scientific passages related to biology, organic chemistry, immunology, genetics, physiology and microbiology. It is very difficult to predict what topics will be covered in this section, but currently, organic chemistry is down to 25 percent of this section and genetics is growing to be a substantial portion. Preparation for this section involves one year each of biology and organic chemistry and recommended courses in immunology, genetics, physiology and other sciences. These are all multiple choice questions. This is scored from 1 to 15.
Writing Sample [THIS SECTION WILL BE DELETED IN JANUARY 2013] : This is 60 minutes of writing on two topics. Each essay is meant to demonstrate one's skills at writing a cohesive, unified first draft exploring the meaning and implications of the questions. This is scored from J to T. The final score is then reported as a composite number score from the first three sections and a letter for the writing section. The highest possible score is 45-T. The average score is 24-O.
*IMPORTANT NOTE: The MCAT will be changing in 2015! Read about the changes here: https://www.aamc.org/students/applying/mcat/.