In theory, I imagine that it is possible to pass SCWCD without any experience, but...
Okay, well, it's possible with enough studying to pass any multiple-choice exam, if you really think about it. In the end, a knowledge-based exam is solely about ability to recall information and present it in response to questions. (As opposed to, say, the
SCJD or
SCEA, that require submission of practical assignments.) I think the major question, though, is why you'd go for an exam without any experience - a certificate without experience isn't very valuable in the work-world, imho.
I'd really suggest that it's better - and easier - to pass the SCWCD exam if you take the time to practice with
JSP and Servlets, since that lends to a real-world application for your certification, rather than simply putting letters after your name.
Just my $0.02.