There are a couple more free tests that I recall off the top of my head, and @TheAnonymous mentioned them - Gold Standard and Kaplan. They are advertised as diagnostics and they are definitely better than nothing. Don't hesitate to re-take some of your AAMC exams though if you have to - not as an indicator of your projected score, but as a way to become more familiar with how the AAMC tests (something that can be forgotten when taking a lot of outside practice tests).