Just passed SCBCD 5 with 95% and just in time (2 days prior to the voucher expiration, with roughly 1-2 month actual preparation time).
Most of the questions were fair from my point of view, apart from a few brainers where i head to guess (and i assume those are the ones I missed).
Some time ago I've read "Enterprise Java Beans 3.0" which is IMHO a good starter for the entire EJB 3.0 topic but doesn't really focus on the exam!
I was clearly missing a book such as "Head first Servlets and JSP" for SCWCD that guides you through the preparation w/o taking things too serious,
and consdering the myriad IT books published each month i'm really surprised that apparently nobody composed such a potential bestseller for SCBCD 5 so far.
I've spent the most time on Enthuware EJBPlus 5 which was really helpfull (especially the Leitner mode which used almost exlusively after i discovered it) and i can only recommend it - it's also reasonable priced.
On the contrary, SUN's E-Practice exam (the 2nd tool I bought) wasn't that much value for money. They bascially grant you access to a pretty old fashioned web interfacte with 2 online tests (static questions) for one year. The explanations are some times not very helpful (you're often encounter one-liners that mainly refer to the specification such as "(A) is right see 1.2.4; (B) is wrong b/c A is right", and there are not many features other then taking the entire test and evaluating the results.
Apart from ejbplus i've studied Mikalai Zaikin's SCBCD 5.0 Guide and i think it pretty much sums up most relevant parts of the CORE + JPA specification. Thanks, man!
Those who prefer reading paper should note that there's a printable version available on javaranch (which id discovered a bit too late).
To sum it up: Get EJBPlus and see to get all questions into the learned status, spend some time with the zaikin guide and if you still have time left, scan the core and JPA specs at least briefly (yes - that's the boring part!