Myself Dharshan and I have recently cleared the A00-221 SAS BIG DATA PROGRAMMING AND LOADING exam with 93%.
The practice I did here helped me not just identify the question I was understanding wrongly and there for choosing wrong ans, also boost my confidence as I am little slow when it comes to the exam.  
I have learned the skill of understanding the question and giving correct answers that too within the limited time of given exam format. 
The question I learned here were very much similar to the one I faced in my final exam. Overall, I am very happy with the service/quality in this price 41$. It is really very difficult to find such a good resource for SAS certificate anywhere else at this price. Thank you www.analyticsexam.com