For those that are usin drugs as a way to pull all nighters, I dont think its right, what I suggest is what efecx said keep readin and readin till you get it memorized and lets say you have 3 weeks till youre exam:

Make a timetable that you are loyal to, keep at it, have sufficent breaks and relaxation periods, to determine how long to work look at youre sylabus per subject, divide into topics and study daily, then leave a few days to recover everything you have jus revised, and then have an EARLY NIGHT, be ready for the exam, be relaxed, be confident.....

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