What are the possibilities?
In general it is not possible to change the mode of evaluation of a course. If for some reason, you wish to see if this can be done, you must submit an application to the relevant study board.
The study board is the only administrative body that has the authority to make changes in the study curriculum and the mode of evaluation of a course. It means that if you wish to try to have the evaluation form of a course changed, the only way to apply for it, is to submit an application to the relevant study board. The study board may or may not grant permission.
You must have the permission from the study board to change the mode of evaluation. It is not enough to have talked to the professor of the course. This is also true if a course is evaluated as a pass-fail and you wish to have a grade instead. You must apply to the relevant study board to ask for approval.