I've passed SCBCD today with 90% in exactly 1 hour. If I had checked my 5-6 marked questions, maybe the result would be a little better, but I was sure I would pass the test.
The test is really not hard - there are no detailed questions from API (method arguments, return types etc.) like in SCJP.
You must *understand* beans' lifecycle (callback methods), transaction mechanism (only 6 transaction attributes) and exceptions (not hard, just think on which layer it is and if it is remote or local). It is necessary to *learn* by heart not so many methods' definitions from only 5-6 interfaces (be sure to know the difference between local/remote int, user transaction and contexts interfaces), and a few snipets from diployment descriptor related to security, transactions and references. There are 2 or 3 very simple EJB-QL questions. Just pay special attention if a question is related to stateless or statefull bean, and CMT or BMT.
I worked with EJB 2.x a few years ago (reading EJB 3rd Edition, O'Reilly), and my reference for the test was the book: Head First SCBCD (O'Reilly). Very good book, but with a few such big mistakes that you can't miss them. I read it twice.
Congrats.... You have mentioned SCBCD for J2EE 1.3. Is it not outdated? This version is not avalable when I checked Sun site. Only SCBCD5.0, which covers EJB3.0 is available. How did you take up this test? I have some work experience in EJB2.0. If the exam you appeared is still available I can take up that. Otherwise I should start EJB3.0 from scratch