I'm redoing some of the problems I was sketchy on in the practice tests. If I finish those, I'm going to redo some of my introductory E&M problems (since for me this is a little more of a sticking point than mechanics). It may sound silly, but since I'm primarily a kinesthetic/tactile learner, it really helps me to re-write the problems even if I know them pretty well--same with equations. I'm going to continue quizzing myself on equations by writing them down from the prompts on my home-made flash cards. And I'm carrying my flashcards with me in my purse so that every spare moment I can be looking over them up to the moment I walk in to take the GRE. Personally, I simply can't just relax for the rest of the week; I just won't be able to til it's over.. That said, I am planning on getting to bed super-early Friday night so that I have plenty of rest for such an early morning exam.