I just want to say that during this finals time you have to get enough sleep to function on the exam the next day. Your brain is like a muscle, it comes back stronger with rest. I was watching a report on 60 minutes, and I'm not saying you're a rat, but whenever rats were deprived of sleep for 6 days, they started dying off. You have to be rested for the big exam the next day. Anywho, off to bed.