I had good Java experience, but little or no Servlets/JSP experience. I used SCWCD study kit for laying foundation, read it 2 times, read the whole JSP 1.2 and Servlets 2.3 Specs, used JWebplus commercial version, took Javaranch's mock exam, Anand Chawla's mock exams, took mock exams from J2eecertificate.com, jdiscuss.com etc etc. This forum helped a lot.
Basically the distribution of questions from Servlets and JSP were almost equal. No surprises. It was easy. It took me 3 whole weeks, 5 hours a day.