In TOEFL, speaking language is the most difficult for most persons, because the schools in China teach you English only for the examations, which brings you up in the habit of listening to English rather than speaking Englsih.
You may be good at doing exercise but not confident with TOEFL speaking language. This application has up to one thousand speaking questions and answers, hundreds of true examination questions and answers in the newest computer based TOEFL speaking language. It'll give you great benefial help.