If you wish to go for SCBCD 5.0 I would recommend that you pick up a good book (see my
thread) on EJB 3 and read through it carefully. Once done read the EJB 3 spec & Mikalai Zaikin notes.
Also install NetBeans 5.5 or 6.0 and run as many examples as possible on Glassfish server.
In my opining 1 month is not enough to get yourself prepared for a good score if your start from zero and are not able to afford 10 hour per day learning sessions... Estimate for from 2 to 4 months... Maybe more if you really do not have prior experience with EJB.
I think it is not worth the effort to go for SCBCD 1.3 now. Entity beans seem to be dying quickly still learning them is a challenge.
SCJP 5.0, SCWCD 1.4, SCBCD 5.0, IBM 000-807,IBM 000-664,IBM 000-399,IBM 000-142,IBM 000-700,IBM 000-255