Don't study at all the day before, that should all be done well in advance. basically, if u aint learned it before then ur not gonna.
I always do my revision before hand, the night before chill out, watch a film, get a pizza and relax. Maybe read over ur most generalised and basic notes for 5 minutes but don't actually study. have a quick beer to lull me off nicely to sleep. next morning wake up, over breakfast (its important to eat breakfast to stimulate u) read over the notes again but don't study properly. arrive in plenty of time so ur not rushing. just before stand outside and get some air, allow urself to relax.
thats my routine anyway and its always done me good.