I didn't prepare for a long time but made sure that I was ready for questions on all objectives. Being SCWCD and SCBCD helped me a lot.
During preparation I used the following resources:
. My notes from SCBCD (basically from Head First EJB book) . Head First Design Patterns . Mark Cade's book . Pete Morgan's notes (see SCEA links) . Articles and tutorials on the web about messaging, security and internationalization. . Whizlabs mock exams. . Javaranch forum.