Please, note the exam asks you for EJB spec knowledge, not J2EE. They have some subtle differences (J2EE is a broader one) and there are questions that assume you know what is not in EJB. You can give a try for Kathy's chapter preview. Look through the forum for a link. As for enough or not... Very hard to tell, it all depends on how you well you understood the mentioned resources.
I second the suggestion on reading the sample chapters that Kathy has so graciously offered up. I'm basically just reading anything I can get my hands on at this point regarding EJB 2.0 - I'm taking the exam tomorrow at 1:30. *shrugs* I figure worst comes to worst, I spent all morning babbling about EJBs... not that anyone in my office would notice...
Theodore Jonathan Casser
SCJP/SCSNI/SCBCD/SCWCD/SCDJWS/SCMAD/SCEA/MCTS/MCPD... and so many more letters than you can shake a stick at!