How can I achieve being an A student and an athlete?

Okay I've notice that am not doing so good in my grades (well enough for my mom to accept them) my grades need to be at least 85 or above. I can easy do this except for math. What can I do to get better at it , its geometry :P. Plus four weeks from now wrestling season is going to start. Were gonna start practice two weeks from now. And am deter mind to at least go to regional and hopefully state. So please advice on being both a good A student and a better athlete in wrestling