I had initially taken the GMAT without taking a course and didn't get the score I needed for my program. Although I've yet to have re-written, I already feel like I've improved. Ethan was a great instructor - he had loads of enthusiasm and was very encouraging (something quite important for 3 hour classes on weekend mornings). I think my instructors thorough knowledge as well as the helpful study guides really helped my chances of improving my score on the GMAT. I benefited primarily from the Quant section. The Data Sufficiency class is great and will really make you re-think the way to approach the questions. Overall, I think the most helpful part of the class was learning how the GMAT tries to trick you and how to overcome those barriers. I highly recommend Ethan's course!!