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From Yakaboo:

The book will help everyone who wants to learn German quickly, efficiently, and experience "immersion in the language environment". However, not everyone is able to live in the language environment in order to learn the language of a country. This textbook was prepared and written in Germany itself, and even the rules, examples and descriptions of the tasks for each lesson are given in German, which does not allow the student to relax, mobilises his or her attention to the utmost, and focuses on understanding the language material itself rather than looking for translations. The books in this series are specially designed to help you learn German in the shortest possible time and with the greatest possible efficiency, and they will also be a good help to the teacher.