Hello Krishna,
I know nothing about SCDJWS, not even the summary. However, I'm studying for SCWCD and its objectives don't say anything about web services. It is focused on:
servlets, filters,
JSP, EL, custom/simple tags, and some design
patterns.
Some of the concepts that are included in SCWCD may be also important for web services, but WS are completly out of the SCWCD scope.
I believe that if you are aiming to master in web services development
you should prepare for SCDJWS, and it must be some "head first SCDJWS" book out there.
Regards.