There is a language test especially for immigrants—the German Test for Immigrants (DTZ). With it, they can prove knowledge at levels A2 and B1. Since January 2023, there are new rules. Anyone who wants to take the DTZ exam must either have a valid entitlement to attend an integration course or attend a course section of the integration course beforehand at their own expense. A course section (module) comprises 100 hours of instruction. At the Volkshochschule (VHS) Tübingen, for example, the full-day language exam costs 150 euros. Listeners of the VHS Tübingen, it says on the VHS homepage, get a 30 euro discount. Passing level B1 is accepted as proof of German language skills for naturalization. Since 2023, it is no longer the provider telc but the Gesellschaft für akademische Studienvorbereitung und Testentwicklung (g.a.s.t.) that is responsible for the German test for immigrants.
More information at https://www.gast.de/de/forschung-entwicklung/entwicklung/auftraege/deutsch-test-fuer-zuwanderer-dtz
and with practice material for preparing for the test
Die Volkshochschule (vhs) in der Katharinenstraße in Tübingen. Foto: tünews INTERNATIONAL / Mostafa Elyasian.