Thank you @Mikalai and @Esteban for your guidance.
Finally I took the upgrade exam and your tips and guidance were very helpful.
My experience/thoughts...for the future exam takers:
1. Be by the exam objectives (except that you have some additional J2EE core patterns to read)
2. Mark Cade and Humphrey Sheil's guide for Java EE 5 is your Bible (I saw some questions from his book's 'Review Your Progress' sections also, but his guide is definitely needed)
3. Adam Bien's Rethinking Java Patterns book a must for Design Patterns (mostly concentrate on the chapter on Infrastructure Patterns and Utilities)
4. Deepak Alur's Core J2EE's Patterns book, you need to know the Presentation tier patterns. I did not see questions on patterns related to other tiers, though some choices had some business tier patterns.
5. Anti-patterns Hot Potato, Leaky Abstractions and Golden Hammer - especially look for scenarios where this can happen - in business tier, web tier or... and is it during messaging or persisting or... 'Bitter Java' and 'Bitter EJB' books can help reference some of these anti-patterns
6. Read through security well, where to apply and how to achieve for an application/system, and also know the different level of security you can provide for application, like message level, transport level and which one provides end-end security, and how are they related to underlying layer, and must know the web application security issues like XSS and SQL Injection, man in the middle, DoS kinds...and how to mitigate them..
7. Go through the JEE 6 Tutorial - at a high level on concepts for webservices, JPA, transactions etc and their applicability..., no need for code or spec.
8. When to use JAX-WS and when to go for JAX-RS, same way for combination of these with Stateful or Stateless scenarios
9. JMS and JCA applicability and when to use these technologies and when to go for webservices...
10. When to go for web-centric or when to go for EJB centric applications
11. The QoS elements against the 2 or 3 tier applications, like making a application 2-tier vs 3 tier, what are the kind of loss or gains you get on performance, maintainability, manageability etc...
No questions on UML and there were no exhibits.
There are some questions which were not clear...and some questions has unclear answer options...
Read the questions well and answer...Time yourself and try to finish within 2 hours and use the last 1/2 hour for reviewing...I could review only last 10 minutes and I had a bunch of questions marked for review (almost all ;) ...I could review only few of them...
All the Best!!!