Hi!
If you are confortable with
EJB 2.x, start learning EJB3. Learn the JPA spec, and
you should be happy in knowing how it simplifies development, after that, you should be ok to start studying for the EJB3 exam.
Be prepared for a very hard
test. I took the beta one and I'm not sure if I passed or not even tough, I've 3+ years exp with EJB and some good knowledge on JPA (and Hibernate).
[]s
Daniel