is it ever a good idea to do this? I find that on each of the two AAMC's i took so far, my mistakes have been from really easy things and that I am getting nervous and overthinking things missing alot of stuff. Is it a good idea to take a full length (obviously not close to test day) without timing on the biological/physical science sections, to better gauge whether the problem is lack of content knowledge, or just test-taking issues. Or is it a waste of a full length?