Based on my own experiences. Ignore or use as you wish.

1) Start early. I never do, but I hear it helps. Statistical studies have shown that cramming is one of the least effective way of learning. It works fine for me, but I'm abnormal.

2) Take breaks. Don't drive yourself insane, just STOP every hour or two. No one wins when you stare at the same textbook for seventeen hours straight and then wonder why you have tunnel vision.

3) Eat. Don't forget about this part. Eating is good, especially if you eat food for thought.

4) Find somewhere quiet. Your room has too many distractions. Trust me.

5) Stop noding. Just for a day or two.

6) If all else fails, find someone smart and cheat off them.