If you decide not to take the tests, you should cancel your appointment to free up the slot for another candidate. This can be done online up to 48 hours before the time of your scheduled test.
This action is irreversible and will end your participation in the selection procedure.
Prometric's booking management system is accessible via the link in the booking confirmation letter in your EPSO account.
Please consult the following link for step-by-step screenshots of the cancellation procedure.