Third, about the materials, there are lot of books about TOEFL in the market, so it is very difficult for the students to chose the one which provides not only the best tehniques ,but also the right format of practice tests that the students will have during the exam.
Hello. I am a stutent to prepare the TOEFL test too.
I bought 2 books in Cambodia. As a student, if i can evaluate both books,
1. The Heinemann TOEFL Preparation Course / Heinemann, M.Kathleen Mahnke & Carolyn B. Duffy
It contains all part of TOEFL test including vocabulary. I like its vocabulrary part which explains how to remember words. According to Korean TOEFL preparing community, its LC part have a tendancy to be longer than LC of the original PBT TOEFL test and it is for intermediate. Their evaluation is
★★★★☆.
2. TOEFL CBT SUCCESS 2003 (I don't have this book now, so it's name can be incorrect)
I like this book's structure explanation part. BUT it has a severe problem. Some answers of its questions are wrong. For example, some exercise problems consist of 10 questions, but its answers are 12. I think the answer part of this book may be the 2004 or 2005 version of it, and question part is 2003 version. I tried to find exact answer list of it in internet, but failed.
However, according to Korean TOEFL preparing community, its original book is the best TOEFL book written in english, which was evaluated as ★★★★★.
I hope this little information can help you. ^^