Hello Dear

There are top IIT coaching institutes in chennai

1. Toppers Academy

2.The hindu zone

3.FIIT JEE

4.Akash institute

5.Brilliant tutorials

6.Anugraham classes

7.IITeach

8.time institute

9.Extel Academy

10.appolo academy

These are based on

Teaching staff qualifications

Previous year results

Methodology in teaching

Infrastructure

Hope its helpful

Good luck