Please don't hate yourself. Do you have a planner and a big calender to plan things out? Sometimes I'll treat myself like a child - meaning I won't get to do something pleasurable until I fulfill a much needed task. Are you distracted easily? What do you do when you're not in school? If you're on the computer or video games for example - restrict yourself and set the timer and say "I'm going to devote 1 hr to ........" Incorporate a certain amount of time daily to school.