Hello,
the specifications that are relevant for the SCBCD 5 certification are the EJB 3.0 spec and the JPA spec. Both can be downloaded
from Sun.
If you are new to EJB, then a general simple introduction that focusses on practical use is a good start. I recommend the
Sun EE Tutorial. AFTER that you can study for the exam specific topics.
For that I recommend Mikalai Zaikin's SCBCD 5.0 Guide, as Christophe suggested. It consists mostly of the relevant spec excerpts, copied together according to the exam topics. Study chapter by chapter, along with the corresponding Enthuware questions.
In my blog I suggested a way to
prepare with Enthuware. You will also find information about
uCertify and
Whizlabs, but my current impression is that Enthuware has a better mock question quality. (Hard to prove, though.) uCertify has a nice interactive mentor to get started with every section, but it doesn't cover all you need.
Kai