The registration a for an exam/resit need to be done at least two weeks before the day on which the exam takes place. Deregistration needs to be done at least seven days before the day on which the exam takes place.
Information about the course you want to take a resit for:
As an exchange student at the Faculty of Science, you can register or deregister for exams and resits by sending an email to io [at] science.ru.nl (io[at]science[dot]ru[dot]nl). Please mention your student number, the course name, course code and date of exam in the email.
Radboud University