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Get you priorities in check, what's more important for you - riding or doing well in school? Many of my friends in college found riding and drinking more important than schoolwork, and failed classes and/or never learned anything. When I found myself in similar situations I would do some work before leaving to go skiing(waking up earlier tha usual), more in the car on the way to the hill, and finish with the easiest stuff when I returned.
Take adderall if you want, but time management is probably the best solution and will help you more as you go through life. Sometimes you can't have your cake and eat it too, God I sound like a parent