MCAT scores are based on the four parts of the MCAT exam: Physical Sciences (PS), Verbal Reasoning (VR), Biological Sciences (BS), and the Writing Sample (WS).
For PS, there are 77 questions, with a scoring range of 1 to 15.
For VR, there are 60 questions, with a scoring range of 1 to 15.
For BS, there are 77 questions, with a scoring range of 1 to 15.
For WS, there are 2 questions, with a scoring range of J to T.
http://www.aamc.org/students/mcat/