You can only be admitted to a Bachelor's degree program if your high school diploma entitles you to attend a university of applied science (Fachhochschulreife) or a research university ("allgemeine Hochschulreife") and you have completed a six weeks internship before enrolling.
Applicants for Master's degree programs must have a German Diplom or Bachelor's degree. The final admission decisions are made on the basis of the student's overall grade point average. Applicants may have to take qualification tests for certain fields and programs.
International applicants must provide proof of a university degree that is equivalent to the German Bachelor's.
Please also take note of the indivivual study and examination regulations of your study program.