one thing that the good folks on here seem to be taking for granted, but that may actually not be a good idea in all cases, is "get a lot of sleep".

beware of "a lot of sleep", unless you actually get "a lot of sleep" on a regular basis.
this board has lots and lots of very type-a posters, so i would imagine that there are a fair number of people here who don't get "a lot of sleep" very often.

fact: state-dependent recall is a very real thing. this principle states, roughly, that you'll have your best recall in a state that's most similar to the state in which you learned the material.

translation: you should get the same amount of sleep on which you've normally been studying for the test.
if you normally get 6 hours of sleep per day, DO NOT sleep 8-9 hours the night before the test, lest you find yourself in a groggy state in which recall is considerably more difficult than you'd anticipated.

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also, make sure that you eat a good pre-exam meal that contains significant quantities of all 3 macronutrients (fat, protein, carbohydrate), and that you bring granola bars or other high-GI carb snacks to the exam with you. (you can put them in your little locker and access them between the different sections of the test.)

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on the day before the test, i would caution against solving any hard problems. instead, you should do one of the following:
* do nothing; chillax (= chill + relax)
* study openers for the quant section. i.e., don't actually solve the problems, but just look at them and declare, with reasonable specificity, how you would start each of them. this is a cool approach, because (a) starting the problem is usually the hardest part, and (b) you can review a hundred problems or more in an hour this way.
* work fairly easy problems, to keep yourself in the groove. DON'T WORK HARD PROBLEMS, unless, like mayonnai5e, you've demonstrated a consistent capacity for learning in that way.