Do NOT study. In undergrad, I would literally walk to my Ochem exams with books in my hand learning mechanisms five minutes before my test. I studied up until the test and it always worked for me since I got As, so I thought it wouldn't be a big deal if I did it for the MCAT. Bad idea. I studied all day before my exam and when I walked into the test, I had so many random hormones, physics formulas, ochem reactions, etc. jumbled in my head. Also, none of that stuff was even on my exam (0 hormone questions, maybe 1 or 2 physics formulas, no ochem reactions, you get the point). The test doesn't test you on content anymore, so studying the day before is useless. Don't make the same mistake I made. Give your brain a rest. Have tons of sex, play video games, hang out with your homies, and just relax.