Sorry for not being able to reply sooner.
Till recently I have had worked with J2EE as an architect/lead developer for a while now. That has obviously helped me for the exam.
As for books I had read the standard books such as Richard Monson's EJB, JMS. I had read and applied the GoF Design Pattern book in my work. So no special reading there for the exam. As for UML, I've been working with it for several years. Would recommend the book 'UML Distilled' for beginners and it is enough for the exam.
Specifically for certification I studied the one by Allen and Bambara. I think it helped me get to know the exam pattern and the topics covered.
Someone asked if the books are available in India. Sorry, I dont know about that but assume these should be available there. I've been working in US for more than a decade now.
Hope to make some time to work on Part II.
Good luck to all preparing to be SCEA.