What I like to do is always keep a crystal of any kinds next to me while I study. It helps me concentrate my thoughts and just a nice little way to incorporate magick into school life.
By studying I don't just mean doing the homework that your teachers give you try to do extra practice at home so you understand the material taught in class better; that way you don't have to slave away to learn the material in class since you already know it.
I also listen to subliminally on YouTube supposedly that help with grades and intelligence.
This summer I'm planning on studying a lot for grade 9 using all of these methods. This summer is basically just practising witchcraft and studying.