Panda,
Ouch, sounds like a hefty schedule. Please don't underestimate how much time is needed for the MCAT. I spent 20-30 hours/week prepping for it. (I took a PR review course which entails practice exams every other weekend. In addition I took all the AAMC practice tests and 3-4 other full length tests handed out by PR. In addition, I spent several hours a day working on V, P and B passages, studying the questions I missed, etc. It can add up to a LOT of time. Thankfully it paid off.
The downside was that I was taking a full load of post-bacc science classes (physics 2, orgo 2 and bio 2 with labs) In the last 3 weeks before the actual MCAT, I fell way behind in my classwork. I had an orgo exam a week after the MCAT and totally bombed it, ruining my grade in the class. I attribute this to trying to take too many classes at once. There's not too much orgo 2 on the exam, and whatever you haven't covered in class you can pick up by reading a prep/review book (this is where a prep course can be especially helpful).
I was very, very lucky that my other grades weren't harmed, but my health suffered and I thought I was going to crack up or collapse a few times that spring.
Please, don't be overly ambitious. Take a light course load (orgo and MAYBE one other science course, as well as a non-science course). You can make it up in the summer. I'm sure you'd rather do that than have to study for retaking the MCAT.
BTW, I later took cell bio and genetics and they are, as they say, quite labor-intensive. These are not courses you want to fall behind in.
