All tests at OCS are from the ELO's (enabling learning objectives) in the front of each chapter (they tell you what you're supposed to walk away from the class with). During the letures, I would just go through all of the ELO's and answer them on that page as the lecture went on. Then, the day of and before the tests, I would rip out those pages and just read them at chow and during any "standby" time. I did pretty well on the academics (not that they're hard), but you don't need to really know anything before you go.
Again, know the general orders, leadership principles, and 5 paragraph order.
good luck,
-itoh