The admission requirements vary depending on the program of study.
The application papers request that you provide evidence of the general requirements.
The requirements for a Master's program are the following:
Candidates must include a certificate (APS-Certificate; APS = Akademische Prüfstelle) obtained from the respective "test center for academic matters in the German Embassy" Beijing / Hanoi / Ulan-Bator. This does not apply to doctoral program candidates.