I received my C1 certificate by the DAAD. That’s easier than thought in Germany…
Most German universities offer language courses parallel to default studying.
The Nuremberg Institute of Technology has the Language Center for that. We are allowed to take such courses during the semester break, too. So I took part of the C1 course. At the end we wrote an essay as the test. This course is accepted as a compulsory optional subject in Computer Science and as the written part for the DAAD test. At the end I had to speak with a native speaker of the Language Center for the speaking part.
I told about my way of life and why I“m studying now. Other topics were stay abroads during conferences and openSUSE. After that I should say something about my favourite countries for studying abroad and Computer Science.
The teacher of the Language Center made some notes and after that she had one list for the university and my certificate. The university has received a list of the speaking test. 2 crosses were made on C2 level and the rest on C1 level, because I have received a lot of English training in speaking in my free time.
The highest DAAD level is C1. So I have received everywhere a C1 level in English. I can apply for studying abroad now. 🙂