Prepping for the GMAT is similar to getting into shape. Manhattan is like a personal trainer--they teach you what exercises do do and how to execute them properly, but it's up to you to put the work and actually lift the weight. The content instruction and study plan Manhattan provided, couple with and the time I was able to invest some practicing and error-logging review problems, I improved my score by over 150 points.
Some additional thoughts: The instructors were very responsive to questions both inside and outside of class. The one-on-one post-course assessment (which is included with the class) was very valuable in terms of planning my last few weeks of study before I took the exam.
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