I bought this book; however, I didn't like it so much. This is only one book from a series including accounting, management, and many other subjects. I think this book is very superficial not only for that reason I mentioned but for the subjects it recovers. In fact, this book covers only some patterns for writing and speaking thats all. I don't know how that guy got 100 at the Toefl exam but this book just discuss a bit in speaking and writing. You can find many of this information in any grammar books.