the coming of my english exam

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as a student in chinese university.the English band 4 examination maybe important for us.and now i begin to prepare for it,so long a time after i say i should do something for it.and i just want to ask.which part is most important for you?which one you thing is the most difficult?Do you have some good ideas about the exam?And it's there anyone can offer me some useful information.for example,do you have a good material in listening or writing? thanks very much!