As per your request I am providing you the lists of top coaching institutes of Delhi.


Vajiram and Ravi IAS Study Centre
IAS Era
Delhi's IAS Study Circle
Rau's IAS Study Circle
Shristi Study Circle
Career Shapers
Career Point
Sachdeva New P.T. College
Upendra's Institute For Admin. Services
Chanakya Academy
IAS Study Forum
Ultimate IAS Study Circle
Hamdard Study Circle
Alternative Learning Systems (P) LTD
Ambition
Apex IAS Academy
Axiom
Career Path
Career Plus
Eklavya IAS Academy
Dronacharya
IES Academy
Institute of Administrative Studies
Interactions IAS Study Circle
Krishna Reddy's IAS Study Point
NIAS
Premier IAS Academy
Sahu Jain Study Centre
Samyak IAS Study Circle
Vidya IAS Academy

Top institutes in India for IAS:

1. Rau's IAS Study Circle, Delhi (now also in Jaipur & Bengaluru) - highly popular coaching institute for Civils established in 1953

2. Chanakya IAS Academy, Delhi - 2014 civil exam topper, Gaurav Agrawal and 3rd ranker, Rachit Raj, studied here.

3. Sathya IAS Academy - 38 candidates of SATHYA IAS ACADEMY emerged successful in 2013 IAS Examinations
4. Brain Tree India, Hyderabad - this academy coached Sweta Mohanty who bagged the second rank in the Civil Service examination, 2011
5. Elite Academy, Mumbai
6. Astitva I.C.S., Jaipur
7. ALS IAS Academy, Delhi
8. Brilliant Tutorials Private. Limited, Chennai
9. Vajiram and Ravi's IAS Academy, Delhi
10. Khan Study Circle, Delhi

All the best for your preparation!!