This book is okay if you know a little English and you want to learn a little more, but the English in it is not really American. The cassettes might have American voices, but you can see that people in England wrote the dialogues. The people in the dialogues say many things that Americans would not say. For example, one teacher says his students are "lovely"". It is very common to say this in England, but not in the United States, and in the U.S., you seldom call men "lovely", because it sounds too feminine. There are also other things that tell you Americans did not write the dialogues: The characters often say, "Do you?" in places where Americans would say, "You do?" They also use the word "actually" too much, and in places where an American would probably not say it unless he's been living in England for many years. You can use British English in the United States, of course, but if you really want to learn *American* English, it is better to get a book that was really written in America. There is a huge number of real American books to choose from, so you don't need this one.