How Long should I study for the SAT, as well as the AP exams?

If you buy one of those SAT prep books and just read that for about an hour every day starting about a month before your test it will work wonders. That's what I did. Well, kinda... it was hard to stay motivated. lol I still scored the 3rd highest in my senior class though. lol

Depends on your learning curve and how bad you want/need a good score. My thinking is do it right the first time to avoid a retake later on!

I personally don't think SAT's need that much revision, I did none at all and got very high levels. They're pretty easy, unless you find certain things very difficult, don't over work yourself. :)