Your previous examinations can actually help you assess your forthcoming tests because professors in general are consistent on how they prepare their test questions especially if they are the type who tends to give quizzes or test often.
So to get a hint on what your upcoming test from a particular professor will be, look over your previous exam on that subject and check the corresponding lectures, notes or homework that the professor gave you during that period.
You can now verify whether your professor get his test questions from the actual lectures, reference books or from the home works given to your class. Then, investigate what kind of test questions that your professors are using. If your professor gave factual questions, you should focus on studying the places, names or dates of the subject. Then,read and concentrate more on the theory and terms if your professor seems to gave test questions about application.