Here are some good sites to test yourself before you take TOEFL.  You can make a self-assessment, and perhaps find your weakness.  Of course, if you feel you have a particular weakness, you can ask me for advice on how to strengthen that particular skill.

http://www.learn4good.com/languages/spec_english_toefl.htm

http://www.testprepreview.com/toefl_practice.htm

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