The best thing to do is take naps. And before you nap, meditate.
Leonardo Di Vinci never slept a full night's rest in his later years. He learned to take small naps every few hours. Doctors, parents of newborns, and many others do this when they have to. It takes a while to get used to.
But if you go to school, this will be very difficult to perform. But a good nap after school can give you more time at night to relax and study.
Scientists for years denied that anyone could "catch up" on sleep. But I've done it my whole life. Only until recently did they finally do a study that proved that indeed you can!
Just Never let yourself get exhausted. That's very bad for your health.
As for magick, I find that the rutilated quartz holds a charge of energy like no other. I am not a morning person, so I always wear it near my solar plexus when I need to be somewhere early and on my top game. Every stone has its own personality though, some are better at certain things than others even if they are the same type of stone. So I suggest picking a pendant in a store, that way you can choose the one that matches your needs.
Charge it in the sunlight.