I started preparations on 4/1/2010 to 4/24/2010 and could average about 2-3 hours a day some more on the weekends.
I only read the links posted on this site, Ivan’s study guide MZ’s test and guide. I got 60% on MZ'’s test.
In the real exam, I did very well on UDDI, WSDL, JAXR, Architecture and JAX-WS. My weakest sections were interoperability, REST, JSON, SAAJ, SOAP 1.2 . I strongly suggest practicing on few mock tests and solving some theory questions. Read some general design questions around interoperability and WS architecture 15/65 questions were purely on architecture, interoperability and design.
Thanks to Ivan and MZ for the notes, it helped me cram. I suggest some additions around WS architecture, design, and interoperability.
Result: 71% (46/65)
My background: I have done WS and SOA for many years. But as most developers, I know very little of JAXR, UDDI, JSON, REST, SAAJ, SwA, SOAP and interoperability. I definitely learnt a lot in 3 weeks.