The complete range of courses offered by the University of Paderborn can be found here: https://www.uni-paderborn.de/studienangebot/
Not all courses start in the summer semester.
"Uni-NC" means that there are admission restrictions. There is a certain number of places available, some of which are allocated to international students in the order of their secondary school leaving grades. Admission is therefore not guaranteed!
If you click on the study program, you will always see the same structure behind it, you can look for example for counselling opportunities and see the corresponding admission requirements ("Zugangsvoraussetzungen"). Please read them carefully!
Aptitude tests for the coming semester: http://www.uni-paderborn.de/zv/3-3/formalitaeten/eignungspruefung/