this was my study path
no previous experience with ejb studied 2/3 months - 1/2h day
Ejb3 in action - read 3-4 times
Mikalai Zaikin's SCBCD 5.0 Guide - read 2-3 times
Enthuware 5 exams - I scored between 60% - 69%
the real exam is much easier then the Enthuware simulator, questions are not tricky and there's never a 'none of these' option.
Some question are very very similar to those you can find in the enthuware simulator because are directly taken from the spec.