The Deutsch-Test für Zuwanderer (DTZ) concludes the integration course and is graded at either A2 or B1. The result matters for citizenship applications and for many residence-permit questions.
Berlin has one of the densest concentrations of language schools in Germany, from BAMF-funded integration courses to evening classes for people in work.
There is nothing currently scheduled for German Test for Immigrants (DTZ) in Berlin. The language schools here still take enquiries.