Have a look at these links :

http://www.goiit.com/posts/list/institutes-and-material-is-quest-by-iitians-58173.htm

http://www.goiit.com/posts/list/institutes-and-material-talk-to-iit-graduates-on-phone-58242.htm

(the numbers mentioned on the above link, I guess must be of the same coaching institute...)

http://www.goiit.com/posts/list/counselling-iitjee-helpline-57052.htm

(this link confirms that the 2 profiles are being used by the same person, as in the previous link, rydbyrd give's the nos. , while in the other one WiseIITian gives the same nos.......=D )

http://www.goiit.com/posts/list/general-which-iitjee-institutes-are-run-by-iit-grads-in-delhi-45403.htm

(again mentioning about QUEST)

http://www.goiit.com/posts/list/institutes-and-material-inviting-complaints-on-coaching-centers-58668.htm#290626

(WiseIITian wants to  defame other institutes here...)

http://www.goiit.com/posts/list/institutes-and-material-is-pie-shutting-down-58238.htm#290623

(WiseIITian says bad about PIE, Rydbyrd supports him)

http://www.goiit.com/posts/list/institutes-and-material-is-quest-by-iitians-58173.htm#290586

WiseIITian advertising as :

Praveen Tyagi - B.Tech (IIT-Roorkee), MS (Univ. of Alabama, USA)



Gaurav Mittal - B.Tech (IIT-Roorkee), MBA (IIM-Lucknow)



They also have the largest network on centers in Delhi.

http://www.goiit.com/posts/list/90/institutes-and-material-fiitjee-aits-rubbish-garbage-42311.htm#288529

WiseIITian says "why do ppl still join fiitjee?"

http://www.goiit.com/posts/list/institutes-and-material-can-someone-help-me-in-preparing-timetable-44625.htm#288528