tammy,
All you really need are the core prereqs. It should be enough for the MCAT, although I agree that biochem and A&P will help (you already took A&P, right?). I took the MCAT w/o Biochem and got a 13 in BS – but I was praying that there wouldn’t be any questions about sugars!
You’ll definitely want to have Physics I&II, Gen chem I&II, and Organic I under your belt before you take the test. Probably good to have Organic II also, but it seemed to me that most of the organic stuff I needed to know was from first semester. I took gen chem so long ago that I can’t remember what I learned in which semester. I had to relearn it all from the review course.
Hope this helps!
Pam
P.S. I have heard that a few med schools do require biochem, but don’t think there are very many that do.