Nearly 100% Brand new series of books that helped me aced 740 in GMAT test recently.
This is the latest set I bought from AMAZON Dec 2017, but I have only used the access code in book 0. There are many test questions / mock exams online for you to explore, if you know what I'm talking about :D
AMAZON link: https://www.amazon.com/gp/product/1941234100
The trick is you can get it now from me rather than weeks later, and it's 20% cheaper.