What I tell my students is to study every day for several hours...Don't Cram...
Then take one day a week and just go out and have some fun to rejuvinate yourself and your brain..Have fun, but limit the etoh and drug use if anny. None is better for studying.
the night before your exam, have a great dinner and try to get some extra rest..Limit your caffiene that day so you can sleep..Keep your room temperture cool.. That will also help you rest. the morning of the exam, have a good breakfast and do some relaxation techniques..
No more studying..What you know is what you now and you may confuse yourself if you add more into the mix..Get to the exam just a little early and of course not late..
Take some deep breaths and best of luck to you.. Please keep me posted.... Hugs, Teresa