From the sounds of it they have quarterly exams. I don't know my school has a exam after each semester (half the year). I also have standardized tests like PSATS, CAPT, and SAT. As for studying, cramming doesn't really work that well, but since your tests are tomorrow go over the main points and then get as much sleep as you can. You don't want a caffeine crash in the middle of your test since you need to concentrate.