1. **Vocabulary and Grammar**: In a C1 course, you will expand your vocabulary and learn more complex grammatical structures. This includes, for example, the subjunctive II, the subjunctive I, indirect speech, passive constructions, and complex sentence structures.

2. **Reading Comprehension**: You will read and understand challenging texts such as literary works, newspaper articles, scientific texts, etc. It also covers how to analyze texts, draw conclusions, and understand arguments.

3. **Listening Comprehension**: You will engage with various spoken texts, such as news broadcasts, podcasts, interviews, etc. This will help you practice your listening comprehension and learn to grasp more complex content.

4. **Speaking**: In a C1 course, you will learn to speak fluently and persuasively. This includes discussions on various topics, presentations, debates, and free speaking. You will also learn to express your opinion, present arguments, and respond to complex questions.

5. **Writing**: You will learn to write complex written texts, such as essays, reports, analyses, etc. This will help you further develop your writing skills and learn to write in a structured and persuasive manner.

6. **Cultural Understanding**: In a C1 course, cultural aspects of the German language and society are also covered. You will learn more about German culture, history, politics, and current events.

Overall, a C1 German course aims to elevate your German proficiency to a very high level, allowing you to confidently and competently use the language in various situations.