first you should listen to the teacher carefully and write notes which is important.Secondly you should speak as more as possible,and I believe practice make perfect.In addition,(或用besides另外的意思)you should read widely ,it will help you much easy to read.What's more,you'd better practice writing more often.Mostimportant of all,you should study English by heart,because where there is a will there is a way.（有志者事竟成）