I don't think you should be worrying about the MCAT at this point in your life. Go through college - and dedicate the time to things that will benefit you as a person. What a lot of people don't realize is the MCAT or medical school is just a path and your destination is far far far ahead of any of those things.
I have loads of acquaintances and family friends who decided to forgo life for the sake of the MCAT and medical school. They don't have true friends, they don't have stable relationships (love or otherwise), they don't have hobbies or decided to not pursue them, and most importantly they don't know who they are. These types of people will be good doctors, no doubt, but once medical school and residency is over and they want to start a life - that's when they realize that there's a hole in their life or that they allowed the definition of a doctor to be the definition of who they are as a person which is a terrible thing to do to yourself because it's so limited and it means you haven't tapped into all the resources that surround you that could've potentially added to the definition of who you are. And when you're 40, a doctor with your own practice, and you look back at your life - you'll be so depressed when you can't find someone to marry, when you don't have any hobbies or when you can't go back into hobbies you might have had because you neglected it for 20 years, that's when you'll regret not taking all the opportunities that college or young-age can provide.
So enjoy undergrad. Take the pre-requistes, focus on your classes, but don't shove away friends, don't take classes just because you think it will benefit you for the MCAT. Don't think about the MCAT when your with your bf/gf - like seriously whoever suggested even the idea of it needs to evaluate their life because it's sad.
Take classes that will make you a more well-rounded person- philosophy, psychology, ethics, anthropology, engineering or math - whatever you feel like you want to add to your knowledge base to make you more well-rounded and so that you allow your mind the ability to tap into different avenues that you wouldn't otherwise do because it may not be under the pre-med curriculum. And don't be shy to take fun classes like wine-tasting or casino management (a class I took and now I love playing Craps at Atlantic City =P)
And as for what you got on the BS in that practice MCAT, that seems great and also doesn't come as a surprise to me. I know for a fact that even to this day - I draw upon my knowledge from AP Biology to answer about...hmm... ALL of the biology question in BS of the MCAT. I think you might have had a pretty amazing AP Bio teacher, because I know I did, and it truly helps. I took AP Biology 6 years ago and to this very day, if I close my eyes I remember everything that my AP Bio teacher taught me - from his corny bio jokes to his amazing powerpoint slides and handouts (which I still have).
In high school taking an AP course, provided that you have a good teacher, is a better experience than in college because the way they teach, the way they give out homework, and the way they test you makes you retain and learn the information better. They give you a structure and by going to class M-F and having homework to do every night and a test every week or every two weeks keeps you on your toes. It's not like that in college. Some professors give out periodic quizzes, but otherwise you're probably just going to have 1-2 tests, a mid-term, and a final (sometimes JUST a mid-term and final) which is NOTHING compared to how frequently you learn and get tested in high school.
So when KnockedUP suggested cutting classes, while I wouldn't agree entirely, I do agree on using that time to self-study. It doesn't have to be MCAT books - in fact you probably shouldn't because what the MCAT books will do is review the basics plus tricks and tips with the assumption that you already learned from textbooks in undergrad. So if you're going to self-study - use the textbook but make sure you can discipline yourself very well. A lot of the times, I wouldn't go to lecture - have friends sign me into class - and attempt to study on my own. But that takes disciple and sometimes you do get distracted by friends so you can try it for a few weeks but if you notice yourself slacking you just can't and shouldn't.
But really...don't worry about the MCAT now. If you work diligently and you keep your focus just like you are doing in high school for your AP classes, then you'll get pay-offs in the end. My cousin is in medical school right now. She went to an Ivy League college, she was some singing group (I forgot what it's called), she plays instruments, she did research there, she took engineering classes, she performed in dozens of concerts, was in a number of groups and societies, and basically enjoyed life while studying hard for the classes she took. She studied for the MCAT for a month - not even - and got a competitive score. I would say she really stretched herself and it probably stressed her out a lot in order to do everything I listed but she enjoyed every minute of it and that's what counts. The best part is that she STILL does these things despite being in medical school (just doesn't it during winter, spring, and summer breaks instead). I know my cousin is also not the norm - but the point is that she's a hard-worker and she wasn't afraid to keep doing the things she was passionate about and she didn't just think about college as an MCAT-prep-school. She used it for what it's supposed to be for - a place of opportunities to shape who you want to be - not just a place where you learn stuff for a job.
So please, get off of SDN for the next 4 years.... don't just think about the MCAT all the time.... enjoy life, enjoy undergrad, and do everything you can so that 20-30-40 years down the road, you can say that hey...that was a great ride.
