Kann man an Deutschschulen auch Deutschprüfungen ablegen?

Basically, German schools prepare you for language exams, such as the telc exams or the Goethe certificates. There are special diploma courses for this, which are based on the exams from previous years to give participants the best possible chance of passing the diploma exams. The exams themselves cannot be taken at every school, as there are selected exam locations. You can find these directly on the website of the respective examination institutes or German schools.