I passed 1st part of 17.04.2012 and I can recommend three things:
1. JEE tutorial on Oracle page (free)
2. P. Allen and J. Bambara "Sun Certified Enterprise Architect for Java EE. Study Guide" especially for design patterns, localization and security
3. Think of self test software. There are many of them on privet I can give you info which i tested
I heard ePractise is also very helpful, bu i didn't see it for OCMJEA