I've been reading "EJB3.0", a little half-heartedly, off and on for about a year, and I read through about half of "EJB3 In Action". I also read through most of "Head First EJB" and some of O'Reilly "JMS" in preparation for the SCEA 1.4 exam.
After reading all of that, I found ejb-3_0-fr-spec-ejbcore.pdf and ejb-3_0-fr-spec-persistence.pdf to be concisely what the test is over. There is very little in those two documents which isn't in the exam, and I'm pretty sure there is nothing in the exam which isn't in those two documents. The books above help to illustrate some of the ideas in the specifications, though.
I'm a little disappointed in my score, but I just decided late last week to cram over the weekend for this, and I've never used EJB at work (though, I've done some J2SE JPA..). I figure this score is good enough.