Just my $.02, but if you guys are this worried about the MCATs I have no doubts as to your dedication and academic ability. The biggest piece of advice I can offer you about the MCATs is DON'T WORRY ABOUT THEM!!!
It's a stupid piece of paper (well when I took it, it was, but I guess now it's a stupid computer screen). You are all better than that, trust me.
Put your time in, sacrifice a few nights out, but remember to do the stuff that you love as well, whether it be working out, reading fiction books, playing video games, whatever. Rememeber, everyone applying to medical school for the most part has good grades and test scores, they want people though, not computers that spit out information. Focus some on your personal statement, essays and EC's as well.
Most importantly, the week before the exam, relax, don't study, go have fun, drink a virgin daquiri on the beach or something. Get a good nights rest before, wake up, eat a little something, and go whip its butt. I have no doubts that you will be fine.
(And just in case you're wondering, I did not set a record among MCAT scores, but I did well enough to get me into my school of choice and not be freaked out about the application process. I decided two months before the April exam that I wanted to apply to school and take the MCAT. So even with very little time to do some self motivated study, it can be done.)