The Allgemeiner Studierenden-Ausschuss (AStA = Student Union) is a body of the student self-administration elected by the students of the university in question. Many student unions have AusländersprecherInnen (Spokesperson for International Students) and / or AusländerreferentInnen (International Consultants) for the special needs of foreign students. Furthermore some student unions offer social advice. You will find further details on the (German) internet pages of the student unions:

More first-hand knowledge is available at the according Fachschaftsrat (student council). It is the elected student representation of the students of a certain subject at the university. In the student council, students dedicate themselves voluntarily for the needs of other students. Normally there are so called "freshmen rallies", giving a survey of the course of studies and the premises. During the consulting times you can address the student council, that is responsible for you.

If you are studying at the Leibniz University of Hanover, you will find the contact address of your student council on the Fachschaftsliste der Leibniz Universität. The student councils of the other universities can be reached via the according student union (see list of links above).