I'd like to reiterate what Cole said. You should definitely take at least one (and preferably more) AAMC full length exams. They'll both be a better predictor of how you're likely to do and also excellent practice to help you hone your test-taking skills. I'd recommend that you take AAMC 3 and another one in the next week or so. The higher numbers are more recent, and thus are slightly more similar to the exam you're likely to face, so maybe buy access to 10 or 11. Wake up in the morning, have a good breakfast and a cup of coffee, go for a short walk to clear your mind, and then sit down and take the exam. Put yourself in an environment without distractions, try to put yourself in a calm and focused frame of mind. If you do well on these, you're probably good to stick with your current test date. If you're not getting scores close to what you want, you might push it back. If you do push it back, I'd say go straight to late May or even June, not March. I know people who've repeatedly pushed their date back four or five times, and I think they'd have been better off just making one big jump. For whatever test date you do, I would recommend that you take as many of the AAMC exams as possible in the preceding several weeks. Approach them seriously, as you would the real test. Notice how your attention may start to wane after a few sections. Figure out how to pace yourself. And after each test, probably the next day, go over every single question you got wrong. Figure out why you missed it. If you're unclear on the concepts being tested, go back to your notes or review book and read about it again. If you made a careless mistake, think about how you can be more consistent and careful. After several such exams, compile a list of which topics are tripping you up, and do some extra review on those again. For me, this was the single most useful component of my studying. It definitely helped me to consistently perform, and to maximize my score.
