Have passed OCEWCD with 94%, feel so relieved after giving the exam.It took 1 month of rigorous preparation.
References I used for my preparation are
1. Head First Servlets and JSP - 2nd Edition(read it twice page to page) and lot of coding.
2. Followed the guide lines given by Benjamin Davies post - https://coderanch.com/t/623652/sr/certification/Passed-OCEJWCD
3. Servlets 3.0 Spec thought initially couldn't understand every bit of it. But after doing some mock exams from Enuthware and Exam Simulator by Piotr Nowicki it was very easy to follow.
4. Enthuware S/w - again a must for preparation.
Few questions in the exam were tricky and most of it were lenghty, need patience and attention to read and answer it accordingly.
Final exam in the Enthuware and the mock exam in HFSJ is a must on the last day for sure will get quite a good amount of questions similar to it.
The only mistake I have done was not to read JSP 2.2 spec. Missed 2 question related to it in the real exam.
Thanks Enthuware S/w again.