Our first AWS professional certificate has been acheived within Wolk. The certification was the Solution Architect Professional.
The exam was tough, not necessarily because of the difficulty of the questions but because of the time limit. There seemed to be exactly the right amount of time to answer the questions and review what was flagged. Just under 3 hours of relentless scenario based questions.
Resources used to prepare:-
Straight onto the Advanced Network Specialty, we have heard it is also a challenge.