This book is good as long as you also buy Workbook I and another grammar book and have a tutor who can fix all the trick questions they ask. It is designed to not give you all the answers and force you to think (get frustrated) and then ask the teacher. If you're brilliant you can figure out some of their trick questions by looking in the back or a chapter or two ahead. There are no answers to any of the exercises, so if you're doing a self-study without a tutor good luck figuring out if you answered correctly.If you have the time to devote to it, get Workbook I (which does have the answers)and have a tutor to help explain the answers to the trick questions, and have a complementary and better grammar book you can refer to,then this is a really good book; but by itself- nada.Of course, you could also just buy the teacher's version and get every execise correct... :)