First, thow a small party (or a big one!) before the exam to get you in a relaxed mood. In my experience, the questions asked on exams reflect what is most important to the professor. They don't always ask questions about ALL of the text and subject matter. I usually try pay attention to what points the professor emphasizes during all of the classes, then I study mosty those aspects of the text, when preparing for an exam. If the course includes regular homework assignments, I have found that the questions asked in the homework assignments and quizzes are almost always the bulk of the tests.

Hi it's important that you look at Past exam papers to see the types of questions asked and then examiners' comments about the answers.

Exams is a kind of torture. I hate them. No, I never prepare for them. There are so many things which are much more important - chess, soccer, partying, bear... :)