hi,wangfei.i want to teii you that many students have the same problem as you .
it easy for you to learn math well, but it needs good ways. i am good at math because ihave good ways. first,you should listen carefully in class and you should take a lot of notes . second, you can do many practice . third,you can ask teacher for help ifyou have trouble inhard questions.
learn in your favorite ways , and you will learn it well.