One of our students called dongdong got 114 out 120. and almost 95% of our students all pass the new toefl test. http://www.franklinedu.org/educn/富兰克林捷报.html
And this list of key words has been of great help. Again, my advice: TOEFL is just TOEFL, and it is not GRE. 1700 key words are enough.