The NC for the different courses varies every semester. Since the University of Duisburg-Essen offers over 100 study facilities in ten faculties, the subjects range from modern East Asian studies to traditional subjects such as teaching, law, business administration and medicine. That is why the NC is of course not standardized. You should therefore expect a high NC for popular subjects. This can be 1.9 for communication sciences in the Bachelor's degree, and even 1.4 for psychology. But don't write off these subjects yet, because not only high school graduates have the chance of a study place. There is an internal lottery procedure, which may give you the place of your dreams. In addition, an average of 2.8 is sufficient for subjects such as German studies for teaching, or an NC of 3.1 for business education. Of course, there are also subjects that do not require admission (e.g. chemistry, mechanical engineering, computer science)