The answer to this question depends upon the learning and memory techniques that work best for you and your learning style. There is no one technique that will work for everyone. You need to evaluate your learning process and determine what works best for you.
If you remember best when you've seen information in print, then you need to make flashcards for yourself of the factual information you may need for the exam. Record facts on post-it notes and put them around the mirror where you put on your makeup, on the refrigerator, and in any other places where you'll see them often. Create posters to illustrate how the individual facts connect with each other and put the posters prominently around your living and studying space.
If you learn by hearing information, use on-line audio versions of your textbook or class lectures to listen to when reviewing. Make up rap songs you can sing to yourself, using the information you need to remember for the lyrics. Record yourself reading or reciting the information for replaying while you are jogging.
If you are a visual learner, use different colors of highlighters to emphasize different aspects of the information and how they relate to each other. Use a variety of fonts to keep your attention focused on the information being presented. Find pictures or create illustrations to associate with the facts.
It all comes back to you analyzing your learning and finding the techniques that work best for you. Good luck!
Another tip straight from a career test-giver: If you can't remember, for example, a character's name, describe the character, and a good teacher will give you at least partial credit. Example: Can't remember Rosencrantz and Guildenstern? Say "Those two false schoolfriends of Hamlet's whom Claudius uses." This answer would show you had read and understood the play's dynamics.
I start by calming down. I take deep breathes and close my eyes for a while. With my eyes still closed, I try to visualize where I last saw that information. Was it a line in the textbook? A page from my notes? I focus on that memory and usually the information comes. If it doesn't; no big deal. I move on to the next question and come back to this one at the end.
Relax. Breathe. And skip the question. Finish up with the rest of your exam first and go back to the question later on. The answer to your question might be hidden in another question in the exam. If you still need to go back, try to refer back to where you've seen this before. When you studied it. How you remembered it before.
A technique that I have used and it has never failed is to look for a question that is remotely similar and look for key points. If it is multiple choice then it is best to really look at each multiple choice question for that clue you need to trigger your memory. Or if it is an extended response I always make it key to remember what point I was studying before and after I got to that point. It usually helps. :D