WhizLabs Practice exams are awesome - I not only passed AWS Solutions Architect Associate, but I bundled my package with AWS Dev Associate practice exams too and was able to clear them both. I completed my Sol architect Associate exam in 25 mins and my Dev Associate Exam in 19 mins.
Practice exams were of great help and they explained why an answer is correct.
I was shocked that some of the questions which were on practice exams actually showed up on my actual exam which was great as I knew them all.
Please do read whitepapers, FAQs, and best practices document from Amazon AWS site. Those are super important along with doing the labs.
Good luck everyone!