Studying Hurts My Head!

I don't think there has been a time in my life when I've been more exhausted! My last 2 board exams are coming up and I have spent so many hours studying for these tests and I've had it!! At the end of every day my head is so full of information and I go to bed with a throbbing headache. The exam this Wednesday is an 8 hour test!! 8 hours! That's a full day of work... but taking a test! My brain is going to be so fried after that! I can't wait for Wednesday to be over! I just really hope that all this studying pays off and that I pass so I don't have to study ever again!