There are practical exams (e.g. mixing or mastering) and there are theoretical exams in the form of multiple choice tests. These multiple choice tests can be passed without requiring a lot of time. For the practical exams, you will receive an analysis, as with all submitted assignments.
The exams you have to submit are shown in the column Submissions in the course overview.
When you hover over the field “Task open” (do not click), you will be shown whether the assignment is an optional exercise or a mandatory exam and for which certificate the submission is required. This also applies to the multiple choice tests.