I also read the Mikalai Zaikin's study notes. Thanks for sharing those notes with us Mikalai.
The most helpful source was the Enthuware exam simulator. It heped me to build my confidence and point out my weak areas. The explanations are excellent and helped me to understand the concepts. So, a big thank to Enthuware When I did the mock exams for the first time i got some where around 55% - 65%. But, after working on my weak areas and doing the exams again after a couple of weeks time, I got around 80% - 90%. Also the exam questions had the same kind of format and difficulty as the real exam.
I also read the simplified EJB 3 specification (ejb-3_0-fr-spec-simplified.pdf).
Last not least, thanks for all of you guys in Java ranch for answering my questions. You have been very helpful as always.
I guess if you understand the concepts the exam should be pretty straight forward. At the start I was not really good with Transactions, Exceptions and Roles. I spent more time on those areas to understand the concepts.
All the best for everyone preparing for this exam.