At last, I completed SCBCD last week after about a month's of preparation. I couldn't see the score report, their system had some problem... still waiting for the report from prometric... Scored 72% in HF final mock exam and 91% in EJBCertificate final mock exam. So hoping to get more than 80%... I think I did well, after all I had read the HFEJB book twice!
Thanks for the authors of the HF book, it really helped clear lot of concepts. So now i'm planning to give SCWCD test by this year end, and already ordered HF JSP book
Few things to concentrate, before giving the exam, are EJB-QL, state diagrams of all beans, Message driven beans, Primary key class for entity beans etc. It's better to read the specification for complete understanding of them.