Hi Neha,
Thank you for the advice and for the link of GMAT Test tool.
I would like to mention that I don't have a stringent timeline for the prep. I can give in a month or two more for that matter if I feel the need for it. But i want to get the best score in my 1st shot as I am not planning on retaking it (as of now

)
I plan to finish off with both of the Manhattan Foundation Books by end of October + The online question banks on Manhattan website.
(I am not finding the Math Foundation book that helpful as 80% of the concepts were already known to me. But still it was a quick recap)
Reading of Newspapers and Novel (Currently Reading - Of Mice and Men by John Steinbeck) is done on regular basis to be more thorough in Vocabulary and English Language as a whole.
After completing with my Foundation Books + Online Question Banks + Vocab List & R.C Idioms in Manhattan Verbal Foundation Book..........I am planning to take a full practice test (1 from the 6 online test by Manhattan) in November 1st week to see what is the improvement in my prep.
Should I also solve the whole of OG book than take the test or should I just take one in November 1st week to check the level ?
Will I be able to solve 80-90% of questions in OG book after completing with both of the Foundation Book or should I also complete few or all of the Manhattan supplement guides and than jump to OG directly?