Study?

OK, last week was awesome! I had my grad assignment done before the coach sent the "official" notice to do the assignment. I then took my final on SAT and thought it was pretty easy. My 10th class doesn't begin until April 12, so I have 2 more weeks "off". I should be Yahooing it, but instead spent part of last week and will spend this week studying for a comprehensive exam through Lamar. My practice test I did well on, with the things that I missed I could at least figure out and "reason" why the right answer was what it was. I easily met the passing standard. So, now I must decide, how much more studying should I do? I don't want to disappoint myself on SAT and not do well. I will need to leave the house by 5:30 AM to drive the 110 miles to Lamar. Sleep will be more important at that point! So, I think I'll study for about another hour tonight, study WED night for a couple hours on law and budget, and then a quick review TH night, without giving it anymore thought. Can I really NOT look at it on FRI??? The week will tell! Why is doing my best at all times so important to me?