Case 1: You are repeating the exam.
You are registered for the module. You should therefore also be able to register for the exam. To register, you must select the semester in which you started the module. If the registration does not work, please contact your . Office for Student Affairs
Case 2: You have never registered for the module.
In order to be able to register for the exam, you would have to be subsequently registered for the module. In principle, this is not possible, exceptions are possible depending on the department. Please contact your . Office for Student Affairs