I've been searching for the same sometime a go, and i found everything in the SpringSource website, how-to study, the test center and etc. I never saw a book dedicated to study for this exam as exist lots of to the sun certifications career and neither an mock, but certainly the springsource forum has more information about it.
Feel free to ask me anything!
www.BlackBeltFactory.com/ui#!/ref=jmotta, SCJP 6, OCWCD JEE5, OCE EJB JEE6
One more thing I forgot to mention is I live in Australia now. Do you think the Spring Certification can help me in getting a job or advancing my career path or not?
I already got SCJP and SCWCD. The results were quite good. However, I'm struggling for Permanent Visa (PR) here. So I don't know the reason I couldn't get a real job in my interests is because of PR or because I haven't got enough things like this.
Now I'm also working as an IT officer but not up to the level that I expected.