Excellent book that we use in C2 at the Goethe Institut in Thessaloniki. The tests are a treasure trove of words so far. In combination with the corresponding CDs needed for listening, the glossary, and the exercises, you can solve them on your own, as long as you know how to solve and grade each part. The Bearbeitung also includes written texts of the listening exercises and exercise samples. 4 books and a lot of word searching on Pons, Linguee, and Wiktionary (even now, I'm in chapter 6 and still searching), I feel that my vocabulary is richer. A small investment and it's worth it for all 4 books in the collection.