1.  Some students want to improve their performance quickly.

2.  The second reason, success is based on failure .For example, Li Ning was a student, his performance was not good, in order to improve his performance, he did very difficult problems all day, because his base was not good, so his improvement was very slowly , later he asked his teacher why his improvement so slowly, his teacher said that you must do easy problems firstly, then you can do some difficult problems .

3.  Only this, you can't improve your performance fastly .