Thank you - all good suggestions.
There is a study plan like that in place already - let me know if it is not exactly what you meant:
gmat-study-plan-go-from-650-to-80235.htmlIn terms of books/materials - I tried to bring those up in the study plan. I don't think there are necessarily 1-2 books that are 700+ level. Again, please tell me if I am not getting it right, but in my mind, the difference between 600 and 700 score is actually paying more attention, being more persistent, asking questions, and often using exact same books. I wish there was a 700-level book

but there is nothing that comes to my mind. Again, I may be forgetting something, so do challenge me!
For math, you can use Kaplan Math Workbook - that's all I used and got q49
If you want 1-2 books for Verbal - I can recommend either PowerScore Verbal Bible or Kaplan Verbal Workbook.