Instead, pick a few important items to learn really well. Resist the temptation to go over everything lightly. Be bold and learn a few things backwards and forwards. Till You Drop. Cramming works by pounding the material into your head.
Repetition is the best way.
You might try tape-recording yourself as you recite. Then replay the tape over and over again. If you are overly tense and stressed, you won't retain the material so easily. Try to relax. Try some breathing exercises.