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If you can replicate what you were doing when you were studying you will help your brain to remember what it was you were studying. For example, if you were chewing a particular flavor of gum while you were studying, you should chew that same flavor during the exam. One of the best things you can do is actually study in the room, in the desk, where you will take the exam. Studying with friends makes the job seem easier and not so tedious. Just make sure that the friend you study with will actually help you, not just play around and waste your time. If you can, take a little time to explain certain things that you are studying to your friend, or have them quiz you on the things you need to learn. You'll be more likely to cement the facts in your head and recall them for the exam. Mnemonics are simply memorization techniques that can help you while you're studying. You can use acronyms to help you, chaining ideas together, or keywords (especially helpful for languages). Acronyms: this is basically a combination of letters, each of which stands for an idea that you will need to remember. For example, the FOIL method in algebra stands for First, Outer, Inner, Last, designating how you're supposed to do an algebraic problem. Chaining creates a story where each word or idea you have to remember cues the next idea that you have to remember. Keywords: for each foreign word you have to remember, pick an English word that sounds like it. Then you'd visualize an image that has both the English word and the foreign word in it. For example: "cabina" is the Spanish word for phone booth. Imagine a cab trying to fit inside a phone booth. You'll be able to recall the image, which will lead you to "cabina." If you visualize a successful outcome, you'll be more likely to actually have a successful outcome, than if you're neutral or negative in what you say about how well you're going to do on the exam. Tell yourself that you will do great. Be confident and don't lose hope.
Do something specific while you study that you can copy during the exam. Study with a friend. Use mnemonics to help you remember key concepts. Stay positive!