Here are what I used in my prep work:
1. SCEA Study guide - Mark Cade - very useful
2. The Java EE 5 Tutorial - Sun - useful, no need to drill to code level
3. SCEA Study Guide - Mikalai Zaikin - rich info for many concepts
4. SCEA Study Guide Book - Allen Bambara, McGrawHill - regret and waste money to buy such book
5. Design Patterns from web and Sun's books
6. Exam techniques from people's experience of this site, thanks!
7. Sun multiple choice online mock exams