telc stands for „The European Language Certificates“.
The telc exam German B1 is a recognized language certificate, which proves that you have basic knowledge of the German language. telc language tests are based on the Common European Framework of Reference for Languages (CEFR). In addition, it might help you in terms of naturalization.
People with level B1 certificate are able to have easy conversations in daily situations, while traveling and also conversations refering to their own interests. They’re also able to speak about own experiences, describe own goals and are able to justify their own opinions. They can also use the most important grammatical structures correctly.
The exam is devided into a written and an oral part. The written part takes about 2 hours and 30 minutes. Before starting the oral exam you will have 20 minutes to prepare yourself. The date of the oral exam might differ from the date of the written exam.
You can find the dates of the telc B1 exam here.