Definitely review your tests and quizzes for some material, as some of the questions will come right off of those. In addition, you should make sure that you review the readings you've done in the book. You should be reading for the "big picture" -- that is, the comprehensive part of the exam will not be as detail-oriented as the other exams, but will be more general -- do you get the concepts? There will also be specific, more detail-oriented material about the meteorology material -- don't forget that!