Make sure you arrive before the academic activities start. The International Relations Office will be the first place to go.
You will be properly registered with a matriculation number and will have Log In credentials for the students portal, which you will use for registering to exams and check timetables or info about classes and professors.
The International Office will be your guide in sorting out issues concerning to your stay.
You don’t need to register to classes in advance; just reach your classroom on the first day of classes and make sure your attendance rate is as high as possible.