I enrolled in a Manhattan GMAT course after my college recommended it. My instructor was extremely knowledgeable and made the three hour class very pleasant. The study guides Manhattan GMAT publishes were also very helpful.
One thing I would note is that it is very important to keep up with the homework between each class. I definitely would not have achieved a 740 without doing all the practice problems each week. Also, it is a good idea to give yourself a few weeks to study after you complete the course (I took 3 weeks) before you take the exam so you can really focus on areas you have trouble with.
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