Fantastic Instructor - Especially helpful for people like me who are not necessarily driven on their own. I had a good handle on the verbal section, but was surprised by how the systematic approach increased my ability to get through the material in a timely fashion. The math tricks were instrumental in getting me through the math section - and with the directed practice, I was able to increase my math score dramatically over the 9 weeks. Further, many of us found the Manhattan practice exams to be a touch harder than the GMAC exam which was a great confidence boost on test day. Also, don't discount the value of taking practice tests in the Manhattan GMAT office which mirrors testing conditions.