how to improve my wrintting english

dear teacher:
I am a Chinese student.this year l will get a macholer test .l worryabout my writting english in the english test which must over 60 if I want to pass the whole entrance test .can you tell me how to improve my writting english effectly it so kind of you to tell me.thanks a lot.

I don't know the Macholer test, so I can't give any specific advice about the writing. Could you give me some examples of the kind of writing you are expected to produce? ;-)