Mooli,
I am very sorry to hear that you failed the exam the 2nd time. I am sure that it must be a big set back for you but if this is something you truly want to attain then don't give up.
You should take some time to step back and reevaluate your study methods and materials. I noticed you mentioned only studying some of the PMBOK chapters. The test is based on the PMBOK guide and you should be reading the entire book in my opinion. I read it completely three times and don't think I would have passed had I not done so. I realize that it is a horribly difficult book to read but you really must focus on the PMBOK for content since that is what the test is based on. The other books like Rita are great supplemental material that should improve your understanding. Also, did you use the PM Exam Simulator? If not, then you should. Again, I would not have passed the exam without it. It not only helped me better understand the material and build knowledge but it was critical to help me in my time management for the exam which is very critical. The PM Exam Simulator also breaks down your results after each exam so that you can identify your weak areas and refocus your studies.
You can pass the exam. I have seen posts from many others on this forum in which they also had to take the exam 3 times but were able to persevere and pass. I wish you all the best of luck.
Cheers,
Mark