I passed the SCBCD yesterday with 91% (64/70). For me, the SCBCD exam is more difficult than SCWCD and SCJP -- because I have little experience (I never developed real-life applications using EJB before, only practice ones) and there's so much memorization which I am not good at (primkey-class? prim-key-class? primkey-field? prim-key-field?)
I read the HFEJB book (which is great), the spec. I did the HF mock exam (78%), jdiscuss (average 80%), jpilot (85%) and ejbcertificate (80%). I also asked and read lots of questions on the forum here.