If you have been accepted for the preparatory German language course (DSH course) you will receive an acceptance letter for the DSH course - not yet for the degree course of your choice.
Whether you are eligible for the degree course will be assessed at the end of the DSH course. You do not have to apply again, but - as admission criteria (e.g. entrance tests, language skills, required minimum grades, accrediations of previous study achievements) to degree courses might change - it is essential that you inform yourself self dependently about the admission requirements for your degree course.
Detailed and up-to-date information about degree courses offered at the University of Paderborn and about the respective admission requirements are available here.
Of course you are welcome to contact the International Office for consultation.