You can drop a course or module yourself using the web interface at any time during the registration period.

You can drop entire modules, including the examinations and courses within these modules, as well as individual courses within a module. Once the registration period is over (three weeks after courses begin), only the examination office for the subject or module is able to remove you from specific courses and/or entire modules. Here, you must specify reasons why you no longer wish to take the course or module.