Jamboree NFC centre was recommended to me by a friend who got 760 in the GMAT and is currently at Wharton. I joined the course here and got a score of 770 recently. My experience here has been positive throughout. The pace here is fast and the core curriculum is finished in 2 months. There are multiple webinars every week to address doubts and to teach advanced concepts, which proved useful and convenient because they can be attended from any location. The study materials are ample and give you hundreds of GMAT-quality questions to practice on from every area, which is very valuable.I took a transfer to another centre closer to home once classes were finished, and I found the staff at both places cordial and helpful. The centre has a library as well, and you can read books by all the major GMAT-prep publishers (Manhattan, Kaplan etc). You can also take practice tests at the computers at the centre, or by logging in from home. In conclusion, if you find yourself comfortable with basic English and Maths, and want to rapidly get up to your best potential, I recommend this centre.