I went on amazon and just ordered as many different books with sample tests in them. I was so busy in clinic, etc. That I made it through one book, and half of the other. Be sure you study the ob, peds, and psych. Those are the heaviest that I didn't have a lot of experience with. Of course there is surg, and IM that is the bulk of the thing. Just do lots of questions.
If you do OMT all the time, don't even bother studying that. The practical is super easy, they pass everyone.