Passed AWS CSAA last month with score 905/1000.
Today passed AWS CDA, scores not yet shared.
Feedback: Do not completely rely on Whizlabs. Having said that, questions and answers/links to documentation provided by whizlabs are really good to give final edge to your preparation.
My preparation style:
AWS documentation for almost all the services with almost hands on with all the services as per exam scope.
Whitepapers (not all only essential ones)
FAQ for almost all the services as per exam scope.
Whizlabs practise exam.