I like to thank Kathy and Bert for writing such a good book. Well done!
in addition to the book, I studied the EJB 2.0 spec, and also did the mock exams in www.ejbcertificate.com. This web site is also very good, and the mock exam questions are very similar to the real exam. You need to sign-up to use this web site, but sign-up is free.