Today I said  to myself:If you don't want to study ,just don't because no one would force you to learn.If you want to study ,you should study hard and be persistent or else you will gain nothing.

To be persistent doesn't mean just to stay in classroom without aweareness of the efficiency.If you can't concentrate on books in the classroom ,you'd better not go to classroom.If you are in the classroom ,you must forcus on study or it's not worth suffering from the sunstroke. So be really persistent!