I passed the AWS CSAA exam today with 89% score.
Thanks a lot to whizlabs team.
The sample exams here were extremely helpful and resembled the actual test very closely.
I can easily say, that around 40% of the questions were exactly same.
I took each sample test twice, the detailed explanation given for each right / wrong answer along with documentation link is extremely helpful.
Also it helped me in focusing on answering 55 questions in one go, as I have a bit of attention deficit disorder .