I heard this course from one of the members of my GMAT study group. I have studied GMAT 2 years as I could not reach the score I desire, over 700. Math was always around 45 and even I was not able to complete the answers. I needed more time. Once I resolved problems without time constraints, I got all right answers. However, I got many wrong answers under time limit.
However, this course resolved my long lasting problem I had had on Quant. This course taught how to approach and to handle problems under limited time. Thanks to this course, my quant improved a lot to 51, perfect score. I appreciate it.