I was a silent reader of this forum and would like to thank you for your inputs. here are few points I thought I should share:

1. I used only Head First PMP book and nothing else. PMBOK is too dry for me, I tried reading it but did not help much. Head First may be covering 95% but I wont bang my had against everything just for the remaining 5%

2. I took only free tests. I did not spend a penny apart from the one required for PMI membership and scheduling PMP exam.