I have bought this book to prepare for the TOEFL in a relatively short time. I think the examples are ok to understand the principles of this test. However, I was shocked when I had a look at this book today. I tried 3 lessons without really looking at the prior examples and when I was about to compare my answers with the ones in the back of the book, I noticed that they are incorrect! the wording seems to be correct but it doesnt correspond with the Letter given. Common!! Whats going on, how are you supposed to prepare as a foreigner for such a test, with that kind of sloppy editing. Also, Lesson 3 question 6 has been printed twice! Honestly, dont buy it! No value for money!! I will put it aside and have a look after the test to see if I can find more mistakes.