A good night's sleep is important... For me, I can function the day after a night of zero sleep, but the next day I'm a zombie.
I knew this going into the exam. Two nights before the April exam I popped some sleepy time meds and zonked. I took the next day off (day before the exam).
The night before the exam, I ate a great dinner, felt relaxed and went to bed between 10 and 11. No sleep although I didn't feel nervous. It was just the run-up to the exam and the pressure I guess. Anyway, rather than fight it and stress, I banked on the sleep the night before. Watched an all night movie got up early and went to a diner. I had a side of english muffins and hash browns which I really didn't want. I brought a thermos of my own coffee because I drink it weak and didn't want to trip out on caffeine. I felt OK during the test, but I did need to drink a few Mtn Dews during the morning and afternoon. I also had some ice T at lunch.. Simple sandwich lunch and chips..
Good Luck
I fortunately passed 1st attempt. Felt wiped out the next day.