What is the telc B1 Prüfung?

The telc B1 Prüfung is a German exam at the B1 level. It tests your ability to communicate in everyday situations. You may need B1 German for work, study, residence, citizenship goals, or personal progress.
The exam has a written part and an oral part. The written exam includes reading, language elements, listening, and writing. The oral exam includes speaking. In many cases, the oral exam takes place as a pair exam.

DTZ Prüfung Guide: Deutsch-Test für Zuwanderer A2–B1 Preparation

Die DTZ-Prüfung bedeutet Deutsch-Test für Zuwanderer. Many learners take this exam at the end of an integration course in Germany.
The DTZ exam checks your German level. Your result can show A2 or B1. So, the exam is important for many learners living in Germany who want to improve their daily communication.
The DTZ Prüfung is practical. It not only tests grammar. It tests how you use German in real life. For example, you may need German at the doctor, at the Jobcenter, at school, with neighbors, or in official letters.