I cleared HDPCD on June 16th. Thanks Durga and itversity for the content. The videos covered all the relevant topics and are in a very simple language. It was really helpful.
My 2 cents with regards to the exam :
Hadoop services were not up. I followed the recommended steps mentioned in the exam instructions to no avail. I highlighted it to proctor help but they were not of any help. After struggling with it for an hour , proctor finally called Hortonworks exam support and they resolved the issue. Good thing was that they reset my timer and was given full 2 hours for the exam.
Exam is on a Ubuntu machine on cloud and I practiced on my Windows laptop. So it took me considerable time to get used to the environment ,like Alt-tab was not working, Cntrl-C, Cntrl-V was not working. Also the screen resolution has to be made 1600*900 which I forgot to do. All these cost me some precious minutes. In the hindsight I think practicing using Cygwin would be wiser.
Last but not the least - practice. Questions were not tough but one can save some time scanning the documentation if you have a good practice.