Passed SA Pro with 879 score after 40 hours of study over 5 weeks. I found the review mode explanations most helpful because they train on strategy and speed – quickly parse the question to identify the primary optimization trade off asked for – e.g. cost effective? low management overhead? high availability? high scalability? expediency of deployment? Then quickly eliminate the obvious dud and align the benefits and limitations of each remaining service combination option with the primary concern of the question. Usually one option will stand out as conflicting with the optimization or have a transposed service name such as CloudWatch instead of CloudTrail making it an inappropriate choice. The real exam questions were quite a bit different but the strategy is the same.