forgive yourself. whether you fail a test, eat too many cookies, say the wrong thing, fail a class, or spend a whole day in bed - learn to forgive yourself. the next day will be better. the next day will be a day closer to your next success. you can do it.
STUDY HARD. No matter if it seems impossible. No matter if it takes time. Wake up early and start studying for your future. Just remember that the feeling of success is the best feeling in the world.