Good morning Ashwini:
Sorry for the delayed response. I was at a professional meeting yesterday and didn't have access to a computer to write back.
My daughter passed the PMP exam late last year and used the exact same method you're using: PrepCast + Simulator + Head First PMP (the latest edition). She also recognized that it wasn't PMBOK 7, but she found it very helpful in learn how to "think" for the PMP exam.
One of the biggest things to remember is that when you go to answer questions - do not answer them the way YOU would work the situation, but as how PMI/PMBOK says you should work the situation. The exam is solely based on standard practice, not necessarily reality in any given scenario.
Best of luck!
Harry