One word for you, Admit Master!
I took the GMAT Mastery Program classes in Jan. 2015. Here are a few points about these classes that, hopefully, will help others to choose what is best for their buck:
1. Class Size: Small, consists of a maximum 12 highly professional/educated individuals. There was an interview prior my registration for these classes, done by the instructor, to make sure the classes maintain their highest level of quality.
2. Course Martial: Very well organized in my (and my classmates') opinion. There is fair mixture of math and verbal with an emphasis on theory, followed by real GMAT questions. This not only helped to practice newly discussed theories, but also helped to retain them by using them on the actual questions.
3. Class Discussions: Class discussions were extremely important and were highly encouraged. I found them very helpful in my learning.
4. Instructor: My instructor, Sergey, was a very knowledgeable, approachable, and charismatic individual. No single questions were remained unanswered during or after the classes. He was always available to help student on different topic, from GMAT problems and concepts to MBA schools and post MBA careers; he was always available to listen, answer, and guide. In my opinion he really took each student's success very serious and personal.
Overall, it worth every penny and beyond. I did my research, and lots of it indeed, prior to signing up for Admit Master classes; and it proved to be a very good choice!