First of all, it's Z in German, and you typed it as Y. The other word is verfugbar, but verfügbar. (Note that if you can't type Umlaut in German, you can use +e instead.)

Secondly, because what you posted is not the full text, it is an excerpt from Zu, but according to the analysis of the context, you should choose Techonomathematik, which is applied mathematics. I'm not a science major, so I might let you take the DSH exam. The following is a rough translation:

First of all, you must take the preparatory course of 1 year, and at least get the certificate of small language from Goethe Center to take the entrance examination for the preparatory course, which is a prerequisite for you to take the preparatory course. The entrance examination for preparatory courses is generally different in German states, and it can only be retaken once in Karlsruhe. In addition, according to the third item of the second paragraph of the German Higher Education Law 18, the research topic you choose in the future is the applied mathematics of KIT. There should be something behind your ZU. )

Ok, you can ask me more questions.