Hi Anil,
I understand your comments about Rita's book. However, I feel it's important to also recognize that people have different approaches to learning and understanding. I used Rita for my studies and, while I didn't necessarily love everything about the book, it was an effective tool for me. I used the elements of the book that worked for me and ignored the rest. I looked thru a number of the study guides available, and from my perspective none of them were perfect for me as a study tool . Some were good enough. Some were totally not my style.
I never read the PMBOK cover-to-cover - not even once, let alone multiple times as many have done. I DID use it as a reference to clarify questions that I had.
This approach was effective for me, and I passed the exam on the first try (thank God).
Best regards,
Tracy