GMAT Complete 2017: The Ultimate in Comprehensive Self-Study for GMAT (Online + Book + Videos + Mobile)
Always study with the most up-to-date prep! Look for GMAT Complete 2018, ISBN 9781506220529, on sale June 6, 2017.
Absolutely stunning and flawless. Promoted to one of my all-time favorite books. I've no clue how the author wrote this, but it is absolutely incredible.