The exam was a little bit harder than I expected because I didnt bone up on listeners too much and I got maybe 7 or 8 questions on them which is a little more than I expected.
You should know all the listeners, the methods, whether or not they need to be included in the web.xml or not, and how they work.
Had about 12 questions on custom tags, but I already knew that would be an area to focus on so there was no problem
None of the other questions presented too many surprises. I bought jwebplus and did all five practice exams and received between 75-85% on them so they do pretty well at gauging your score with the exam.
Blair