I would like to share my experience with this web, www.analyticsexam.com. They have many SAS certificates and as I have checked reviews and feedbacks of SAS Clinical Trials as well as of others, most of (95% of reviews) I would say were positive. This was a little too much good kind of thing, but as they were having money back guarantee, I have taken access.
After studying and attending some practice tests, I feel, the reviews were correct and now after giving and passing the certification exam A00-280, I feel they were absolutely correct.
Go for it and you will not regrate.
My preparation and review.