You may not understand the title, I'm going to explain.
After studying for 2 or 1 hour you need to rest as I mentioned. Because after along amount of time studying your eyes will be tired, your body need to do something, not staying one place. The best thing I recommend is doing house work, you may not like it, but you probably like doing it more than study. You will think it's a stupid idea because you can play your phone after study, but no, I've heard alot of affects that phone gets into people, the scariest is that it affects your brain, which may destroy your life forever. You can also plant a tree, go jogging, hangout with friends...
(Thank you so much for 200+ views)