Probably the 3 best ways I found to study (do all of them):
-Study the decks
-Read useful parts of the book First Aid for USMLE
-Take lots of old exams for practice
-Repeat
(I would do the decks more than once. I did them twice: once slowly, and once at warp speed. The reason is that you will forget the material you went through, so you need to refresh)