This is a B1 level book that combines grammar and vocabulary. It consists of 50 lessons (20 double Lessons (a and b) + 10 Reviews) that include grammar theory, vocabulary, and a wide variety of exercises. At the end of the book, there are a Glossary, tables with Verbs & Tenses, and a list of Irregular Verbs. The book is accompanied by a Test Booklet with 10 Revision Tests.