Sorry for the delay in replying back. Study material I used are as follows.
1: SOA fundamentals in a nutshell - You can get this from IBM website. Just do a search,otherwise post your email here I will send it to you.
2: Red books
- SOA Governance and Management.pdf - Chapter 1,2 and 3
- WebSphere Service Registry and Repository Handbook- Chapter 1,2 and 5
Some of the question are very easy and some are confusing. My recommendation is to go through the Objective in great details and remember the buz words mentioned there. For confusing question look for these buzz words. This will reallly help to narrow down the answer.
And finally, do not forget to give the IBM assessment exam.