If you've done CTY before, (the john hopkins program) you can take their AP Calculus Math course online. I've always been satisfied with CTY's online math courses (i'm pretty sure you can still take the course if you've never done CTY, as long as you took the SAT's)
CTYOnline - AP Calculus BC
it's individually paced, so even though it includes calculus AB materials, you can go through those fast yourself?