The Exercise Book contains a multitude of exercises to consolidate the material, with difficulty level markings, comparative exercises, and grammar explanations. It also includes review exercises and self-assessment tests for each thematic unit. Additionally, at the end of each thematic unit, there is information, explanations, and exercises for students preparing for the Goethe-Zertifikat B1 exam (Zertifikat Deutsch and Zertifikat Deutsch fur Jugendliche), as well as a comprehensive test at the end of the book. The book concludes with lists of irregular verbs and verbs with prepositions. Planet is the first teaching method exclusively designed for Greek students. It is aimed at beginner students aged 11 and leads them through three volumes to level B1 of the Common European Framework of Reference. It prepares students for the Fit in Deutsch 1 (level A1) and Fit in Deutsch 2 (level A2) exams, as well as the Goethe-Zertifikat B1 (Zertifikat Deutsch and Zertifikat Deutsch fur Jugendliche), and offers a comprehensive teaching proposal for the lesson. The series is distinguished by its clear structure: every two chapters constitute a thematic unit and tell a story. This keeps the student's interest constant. The main focus is on listening and reading comprehension skills, as well as written and oral production. A new element for Greek students is the mediation practiced based on situations from Greek everyday life. Additionally, the series provides students with the necessary vocabulary to express their experiences and interests. The "Zum Schluss" section at the end of each thematic unit offers additional texts, techniques for understanding written texts, information about German-speaking countries, suggestions for group work, tips for more effective study organization, and review exercises. The "Nα τι ξέρω!" section includes a concise presentation of grammar, as well as a list of the most important vocabulary and expressions.