710 -> 770

When I took the GMAT in 2006, I thought a single volume, all-in-one book was enough. And it was enough, at least to get a 710.

Fast forward to 2012. My previous score had expired, so I needed to retake the test. What I felt I lacked in my previous attempt was a focus on concepts, instead of just "tricks". Manhattan GMAT seemed to advertise more than any other prep program that it was "concept-focused". Not only was this true, but I think it had the perfect balance of concepts with strategies ("tricks") to make it the perfect prep program. Full disclosure: I consistently scored very high on the Verbal section, so I completely blew off studying the Verbal strategy guides and focused solely on the Quant section. I'm sure the Verbal was just as good, though. :)