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I know that this sounds stupidly simple, but just go out there and get good grades. If you put up an honest effort by doing your homework and studying reasonably for tests- there's no way you can go wrong. If you're struggling with something, go and talk to your teacher after class about it, more than likely they'll be willing to help you get a good grade in their class if you put the effort it. Just saying.
Do well in school and the skiing won't be an issue. Middle and high school are absurdly easy to do well in, so stop bitching, get off facebook (and ns), realize school is important, man the fuck up and do well. You have to earn that shit.