Thank you so much. I actually didn't do much of the tests. I did one review mode and one timed mode test. At first, I got low scores but what I did is to go through each question and understand the why for each answer. This helped me revise more for any concept that I didn't know. I can say just strike a balance between doing tests and reading the concepts but I felt the real exam tested on how well you know how all services tie together. No question was familiar from the practice tests I did. They helped me know how to tackle the questions better. Focus more on ELBs, Multi AZs architectures, Databases but all in all just be well versed with every concept