Study hard, but study wise. Your brain can only absorb as much as your butt will let you. One of the best things I have learned over the years about studying for finals is to take breaks very hour for about 30 minutes and hit it again. Also get a good night rest. You will be able to concentrate better while taking the test if you are rested. It will cut down the chances of getting brain vapor lock during the test. Of course you have been taking test for a long time and you do not need an old man telling how to study. So forget everything that I have said.
