Hi,
I took my GMAT the second time in 2013 (with IR section) and scored 740. I used to work on weekdays which is why I joined Jamboree weekend batch and I was very happy with them. The instructor was genuinely interested in the progress of students and was forever ready to provide extra help and guidance. The admin staff was also super friendly and accommodated special needs, if any. Our instructor made sure we had enough to practice outside of class and was very methodical in his teaching style. It is very important to identify the type of question and the type of ways in which the exam can trick you into clicking the wrong answer. The instructor taught us smart studying and Jamboree study material built a very good foundation to score 700+. Everyone at Jamboree is approachable and willing to work things out for the benefit of students.

Studying for GMAT was made fun and interesting by our instructor. I would say this is the best thing about Jamboree, building stamina for the test by making it fun instead of tiring.