How to apply to an AP class if school doesn't provide it?

I do not live in the us and am planning to study there. My school doesn't provide ap classes but i know a school half an hour away which does. And what ap subjects should i take? I'm thinking about applying to an internship. I'm taking undergraduate engineering then master and phd in astrophysics. What are some good ones that can apply to(that are available internationally). I live in southeast asia by the way