Here there's a webpage that can help
http://www.fluechtlingshilfe-castrop.de/information-for-refugees/study-in-germany/
It includes:
- Universities that offer courses for refugees as guest students/visiting students.
- Map of universities where refugees can study as guests or as students in October 2015
- General information from the Federal Office for Migration and Refugees in Germany regarding legal requirements of residence for third-country nationals that want to study in Germany.
- Instructions about how to prepare and apply for studying at a German university
- Information about scholarships
- What to do If you have acquired a school leaving certificate which qualifies you to study in your home country, but which is not recognised as a higher education entrance qualification in Germany (Studienkolleg)