Dont Fear, You can do it.
Go thro the Exam notes prepared by ranchers
who have already taken their exams.
Concentrate on Taglibs,Deployment Descriptors,APIs.
If Time Permits Do a fast reading on Jsp and Servlet Basics.
If you will defnitely clear the exams.After the exams do let me know your experience bcoz i am also going to take the exams soon...
BEST OF LUCK