If you are ill and cannot make it to a midterm or examination you need to undertake several actions to solve this problem. They can a be found in the OER article 5.4 and 5.5 and in the “Examenregelement” appendix 1. Both these documents can be found here.
In short; you first need to have a doctor’s statement and you need to send an email to your study advisor, (Mrs. Baukje Osinga – Kuipers for bachelor students) within 24 hours of the midterm or exam. She will handle it further, although you assistance will be required.