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Well it's only half way through the year so it obviously isn't THE AP test. In my personal experience going through AP world in 10th grade, test's were always easy; but then again i have an inate passion for it. But judging by the amount you have studied, the absolute best thing you can do is rest and get a good breakfast. Just use the process of elimination on the Multiple choice, and assuming your writing a DBQ/Comp essay you've put in a good amount of studying. Just remember to stick to the prompt, and answer the question using ALL of what it asks for.

Don't worry, things always have a way of working themselves out. 9 hours is plenty, and more than enough, more than doubled what is typical, like 4 hours.