Actually, there is no need to work so hard. Learning is important, but make good use of time to play! Look at the scenery outside, watch movies, and exchange more feelings with your classmates. If you are happy, you will naturally not be tired. Otherwise, you will live in vain all your life, and you will be really happy when you are young. Don't waste, don't play, and you won't know anything when you step into the society after learning.