Heya Moose, how's it going? Been a looong time since I stopped by this forum, just thought I'd stop by to torment the MCAT-ers
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Just to add to what Moose and Shrike are saying (listen to these guys, they know what they're talking about) sticking to the TPR schedule and doing the homework, really analyzing your test performance, and asking questions as soon as you don't understand something are basically the keys to raising your score. I scored a 28 on the diag and raised my score by 12 points - I probably would've gotten a 31 or 32 or so on the real thing without hard-core MCAT-geared studying. I'd finished almost all of the prereqs but the MCAT-specific studying let me soak up exactly what I needed to know for the test. In my opinion the prereqs alone aren't enough unless you approached your classes with an eye to really, really learn the material at a very basic level and not just learn what you needed to learn to get a good grade. Sadly, I think most people do the latter. MCAT studying, more than anything, will give you a fundamental understanding of the material, as well as preparation for specific topics that are common questions.
Expect to see your first substantial score increase on the last TPR diag, the one you take right before you take the AAMC ones. I don't think anyone in my class (or anyone on this board) saw their scores jump until then. And some didn't see a score increase until the AAMCs. Not sure what it is, but it just seems to work out that way.
Make sure you do the homework and study on your own. There were a couple kids in my class who kind of just showed up (sometimes) and rarely did the practice problems. Just attending the class isn't going to cut it; the kids who did that complained loudly that their scores weren't going up but really, how could they be surprised? You're only going to get out what you put in. If you're not using all the materials they give you (with the notable exception of the A-D tests...) you're wasting your $1500. Seriously, I don't know what those kids were thinking.
Also,
TREAT EVERY DIAG LIKE THE REAL THING!!! That means going to bed early the night before, eating a good breakfast, showing up early, and
COMPLETING EVERY SECTION TO THE BEST OF YOUR ABILITY!!! If you can't handle a diag, the real thing ain't gonna be any easier. If that means sacrificing one night of hanging out with friends, one night of partying, one night of playing video games, whatever,
DO IT! The real thing will be stressful enough as it is, and walking into it having never experienced simulated testing conditions will only make it worse.
Now, a great MCAT score isn't a guarantee of admission, but getting a solid score means one less thing to worry about. If I don't get in anywhere this year, I know what areas I have to improve and my MCAT score isn't one of them.