AP bio, AP chem, and AP physics actually cover a lot of the same stuff as on the mcat because after all, they are supposed to be the hs equivalent of gen bio, chem, and physics. so if you've taken those, in theory you should know all of the material covered in the physical sciences section and 1/2 of the biological sciences.
In theory, sure. In practice, college classes will go into a lot more depth and detail than high school AP classes.</p>
<p>OP, there is no reason for you to have taken a practice MCAT before even beginning college. Stop worrying about it for 3-4 years.</p>