I choose the "Head First Servlets and JSP" book to study for the exam mainly because it had more stars than this one. Besides "Head First ..." books are usually more brain friendly. Read the "Head First Design Patterns", a very good introduction to design patterns, so that you know what I mean by brain friendly. Servlet book covers the old JSP's. I think Sun should have put some JSF questions instead. The book has a mock exam at the back. I scored %69 on it. On the real exam I scored %79 so the questions are a bit harder and some of them are a bit unclear.
Anyway I passed the exam :)