Gopinath:
I would advise a tremendous amount of caution if you're trying to game the PMP exam in this fashion. Here is my reasoning:
1. The test bank at PMI is, presumably, huge and probability of any two exams being the same is just about zero.
2. Agile and traditional waterfall have a substantial amount of common elements and cross-over. Personally, I found it very difficult to categorically state if a question was Agile-related unless it had a give-away such as "iterative" or some other clearly stated agile principle. I would find it difficult to attribute 50 questions of an intense, four-hour exam specifically to Agile methodology.
3. I have found PMI to always be a professional organization in that they don't tend to mess with people,. I will take them at their word that the PMP exam content has not changed and will not change until 1/1/2021.
4. The reporter may very well have drawn the short stick and got a lot of Agile-related questions.
5. A basic knowledge of Agile methodology is required the current PMP exam already.
My advice would be to stay the course and prepare using the current tools. If you try to game it and focus mainly on Agile without understanding the core content of the PMBOK, you will probably lose in the long run.
My 2-cents worth only here.
Harry
+++++
Harry J. Elston, Ph.D., CIH, PMP