is divided into units, each of which covers an important grammar topic. Each unit starts with an explanation of the grammar and is followed by a set of practice exercises. The flexible format means that you can either work through the books or choose the order in which you want to study the grammar topics, perhaps starting with those that are giving you problems. The downloadable tests for the end of eachunit or section mean youcan see how much you have learned. When you've finished the book you can try the exit test so you know you are ready for