The CISA Exam

couple of thoughts:
1) Study often and for short (45min - 1hr max) time periods. After each one, take a break for 10 minutes or so.
2) Eat and drink healthy things.
3) Total immersion is the key. If you dont have a lot of time, spend every waking moment thinking about this material and going over it in your head. Study. break. study. break. eat. ....But whatever you do, don't try to study other, irrelevant material. You will either distract yourself from the real material or just get confused at crunch time.
4) Don't try to "cram". Staying up all night trying to study leaves you with not enough sleep and you will have a harder time focusing on it the next time you pick it up.

Either way, this has worked very well for me and seems to get the job done as long as i have a few days (or, hopefully more) to devote to it. Good luck on the test and let me know how everything comes out.