Back in March I took the exam MB-200 Microsoft Dynamics 365 Customer Engagement Core when it still was a beta version. For a while, I forgot about it because the results won’t be available until the certification was fully accesible. Recently, I wonder what happened to it, I checked my Microsoft certifications profile and I happily noticed a congratulations message indicating that I have passed the exam.

Are you thinking about taking it? If so, my advice would be to read and learn very well the administrator and customiser guides, which you can find in the following links:
Administrator guide: https://docs.microsoft.com/en-gb/dynamics365/customer-engagement/admin/admin-guide
Customiser guide: https://docs.microsoft.com/en-gb/dynamics365/customer-engagement/customize/overview