I am very satisfied with Manhattan GMAT prep. I did the online class that meets every Saturdays for 3 hours. My instructor was Jonathan Winamer who explained the concepts very well.
My first CAT score was 620 without any prep, and on the real exam I scored a 730. The strategy guides are very effective and you definitely learn a lot just by reading through the guides. Only drawback to the online classes was that the usefulness of the class depends on your classmates. If another classmate asks a question to which you already know the answer, you are missing out on those 5 minutes. But since this is true for any type of class, I guess it is inevitable. However, the instructor was very helpful and if a student asked a question that most people knew the answer to, he would stay after class to explain that question to the student and save the actual "class time" for something that can benefit the majority of the class.
In summary, if you purchase Manhattan GMAT prep course and materials and work extremely hard, you will definitely score 700+. I definitely recommend Manhattan GMAT to anyone who wants to score high on the GMAT.
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