Go for second edition of Head First Servlet & JSP(HFSJ).
I think that book is enough for preparation(I am also preparing from it) after preparation you can buy any mock exam for practice or many free mocks available on internet.
Joined: Oct 26, 2008
Thanks, my HFSJ is on its way.
Joined: Jul 27, 2006
I am sure you won't regret studing HFSJ, even if you don't know anything about web development, the book starts from the very basic of http, don't worry!!