The first thing I did was to read the Skills measured very carefully.
Second, I worked through the Micosoft Leaning paths (6 paths in total).
Third, I worked through practical exercises in Azure Devops and Azure Portal.
Fourthly, I read the information provided by @thomasmaurer about the exam preparation.
Fifth, I worked through the Microsoft learning paths again (all 6 paths)!
I hope this information helps you, good luck!
Regards, Tom Wechsler