Hi this italki site will give you lots of tips for the CET 4 exam http://www.italki.com/knowledge/page/CET%204%20EXAM%20PREPARATION%20TIPS.htm

Study. Read a lot written in English. Does not have to be a textbook or even a book. It can be a magazine or other on a topic you like.

So easy!But it's difficult to get high marks.And I wil participate in the CET6 in December,too. Fighting!