All, I highly recommend these practice tests. I passed the exam yesterday on my initial attempt. The practice tests, the detailed explanations, and links to the relevant AWS info were the keys to my success. I took 2 different learning programs (Udemy, Whizlabs) to prep for the exam however these tests are what made the difference for me.
Two additional thoughts. First, I wish I had gone through a couple of these practice exams BEFORE I took the two training classes as it would have helped me understand and focus on the detailed things I needed to learn in the classes and AWS materials review. Second, 65 detailed questions in 170 minutes is a grind. I recommend taking a couple tests under “exam conditions” and trying for your best score to develop your mental stamina.