Remote Dynamics GP exams via Prometric are coming. Until then, there are a lot of options to take exams in person. Check out the list and get more information at Certification Exams Now Available for Dynamics – Dynamics Pro
Certification Exams Now Available for Dynamics – Dynamics Pro
Archived post from 2016. Dynamics GP and the links it points to have changed since; check current documentation before relying on version-specific steps.