If you do have questions concerning your course of studies, amongst others you can directly address the faculty / department you are studying at. Contacts are e.g. the so called Auslandsbeauftragten (people in charge of foreign students; refer to the List of International Programme Coordinators of the Faculties of the Leibniz University of Hanover).

Furthermore, there are subject-related student tutorials for the care of international students at many faculties / departments.

In order to get information about the offers of your faculty / department, refer to the according university websites and advance to the subject in question.

Here are once more the university links: