Congratulations Prasad!

I do agree with you, this exam is tough. I've passed this exam last August 22, 2014 with 89% and it took me 3 months of review, 2 hours a day at least. Like most of the guys who took this certification my preparation started by reading Pro JPA 2 first and second edition books of Mike Keith and Merrick Schincariol. Second edition is not a must but I'm interested with what's new in JPA 2.1. Next was I've read JPA 2.0 specs twice. The last part of my preparation was focused on Enthuware Mock Exam, it's a big help and it will
boost your confidence.
Right now, I'm starting to prepare for OCEEJBD 6, I'm looking at few books like Enterprise JavaBeans 3.1, 6th Edition by Andrew Lee Rubinger and Bill Burke, EJB3 In Action, Fritz Walraven's OCEEJBD6 and Ivan Krizan's OCPEJB6 study notes.
Once again, congrats!