exams are a pain. Had one yesterday and a demonstration for advanced interent systems this morning (9.15) I think the exam went reasonable and the demo this morning went good
For the exam revision I compressed materials onto one piece of A4 both sides and looked at that quite a lot. Slowly you will remember stuff, just dont hammer it for hours or your brain will turn off and not remember anything (or mine did that) I have the short term memory of a fly and that made me remember.
Also as already said, go to the gym or do some pressups/pullups etc
I spin poi (just weights in socks) to morcheeba for a few hours, that really helped me de-stress. Also eat right and get some good sleep, easy after a gym session/home gym then shower
good luck everyone