https://www.epo.org/en/service-support/faq/learning/european-qualifying-examination/registration-rule-28-ipree/when-do-i

When do I have to register?

Shortly after starting their training, candidates must register.

Candidates’ academic qualifications and professional activities are checked at the start of training and, where appropriate, recognised.

Only candidates duly registered will be able to enrol for paper F.