Tableau Desktop Certified Associate Exam

I am an engineer and was looking to build the career with analytics and data mining, I was hearing a lot about Tableau and therefore I have decided to be Tableau Desktop Certified Associate certified to start with. I have prepared on my own and attended the certification exam one month back, I failed. I was not sure on what could be the reason for this. Then, I took membership here and soon I started practising, I started realizing the mistakes I did, this was not lacking the subject knowledge but this was mainly due to less experience on understanding the question correctly. I learn how to put the subject knowledge in use during the exam with the help of these practice tests. 
A big Thank you to the team who have worked and created this web tool.

Thank you.