At first,you should know why you english is poor,you spent less time on it or use a wrong way to study??Secondly,i think you should be familiar with grammer ,it is very important for you.Finally, you can read some english books or films or something about english ,so that you can have a feeling about english.Study is a long time things, you should consist to learn,although my english also not very well,but i think if i can catch the opportunity to study english, i will success...