Congratulation as well Sreelatha!
For Rakesh, when I passed the PMI-ACP exam, I ended up only using the PrepCast course and did not look at any other books. Watching all of the PrepCast videos twice combined with my own work experience was enough to pass. I took approx. 8-12 weeks to study (an hour or two a day). After taking the PMP exam, I found the PMI-ACP exam to be easier (in fact, taking the PMP first certainly helped me understand how PMI thinks and how to answer some of the questions).
Thanks,
Jeremy