I suggest you guys to prepare with dedication. it just took 45 days for me to prepare, I had very less exp on Web Services, earlier.
This is how I prepared for the exam,
..daily max-5 hrs of theory and atleast 1hr of practical.
Lots of opensource tools are available in the market to try the best out the J2EE Web Services. Infact I used MyEclipse to try simple practicals.