From my MCAT studying I noticed the following: You need no knowledge of gen chem, organic chem, or physics beyond that covered in the required classes. Doing well in bio requires that you understand genetics, biochem, and a&p beyond the level it is taught in the classes (this is especially true for Genetics). Doesnt this give bio majors an unfair advantage of the MCAT? I mean, if I am a chem major it probably isnt going to help my PS score out much at all since everything on the PS section seems to be very basic. However, If i am a bio major I have probably taken biochem, genetics, and something relating to physiology - which would likely make the BS section a breeze (i know that having taken Genetics has really saved my butt, since I dont think i learned half of the genetics material covered on the MCAT till I took the class). What do you think? I am scoring pretty well on BS but I still find it rather annoying. An interesting aside though, is that the highest test scorers tend to be philosophy majors and math majors even though they have little science background beyond the required courses.