1. Read Head-First Servlets & JSP twice
2. Completed all test exams in Enthuware
3. Passed exam
I have also tried Wizlab's mock exams, and in my opinion Enthuware is much better. Questions in Enthuware contain less errors, drag and drop questions in Wizlabs do not work correctly neither in Firefox nor Chrome (in Chrome it is totally impossible to answer the question).
Thanks to Bryan Basham, Kathy Sierra, Bert Bates for the great book! I wish there was one for Business Component Developer Exam (EJB in Action is sooo boooring)