I went through quant part of NOVA GMAT Prep and didn't find it useful and felt that difficulty level is not for 700+ score. I was disappointed and didn't do verbal part from the book.
I'm going back to OG and GMATClub forum questions.
PS I had older NOVA GMAT Prep from 2005. I'm not sure whether material in newer books has completely changed.
Thanks for the information! It's a shame, though, that the Nova book didn't work out for you. I wish this kudos could be awarded under more positive circumstances.