It sometimes happen; even knowing all my syllabus I can't help studying, but I've got know some of the ways. Sharing them with you with a Dua that they may help you.
1: Know your syllabus, take out some of the topics and time; I need to carry out time for 6 topics now and I think 4 hours will be enough.
2: Take all your needs with you and move to solitude, don't leave your study place unless you are done.
3: Take short breaks like, take time for exercise, jumping, pushups, hanging. Abandon gadgets whilst its your study time.
4: Give yourself a reward when you are done with your topics. I am going to watch "the Flash" episode after finishing.
5: When you go hectic when studying, refresh yourself with tea, coffee or any other drink.
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Study Hacks
NonfiksiIt's not a story but a counselling to help you in your studies.