Study the J2EE Blueprints
Read the applicable sections of Core Java 2 (Security, Internationalization, etc.)
Read "Enterprise Java Beans" by Richard Monson-Haefel
Read "UML Distilled" by Martin Fowler
Study "Java Design Patterns" by James W. Cooper (Great Stuff!)
Do the practice tests people mentioned in this news group, esp. Amit Jnagal's and Jaworski's tests.
Learn from
http://www.stormpages.com/jnagal/index.html and if you want to make sure you pass:
Do the J2EE tutorial (Pet Store)
http://www.cyberdosti.com