AP's overrated. I took Calc AB exam last year and got a 5, but I retook Differential Calculus at UBC anyway like most other people who'd done AP, which I think was a good decision. It doesn't really make sense to not do any math at all for an entire term, and AP's really a dumbed-down version of university first year stuff, so you actually miss out on a few things. I don't know what your plans are, but try not to stress yourself over that stuff because you'll probably have to redo it in the future anyways. By the way, if you're entering high school next year, that means you're in grade 9 or 10, doesn't it? That's really early for AP.