Hi Vivekanandan,

IAS is an National Exam which is conducted by UPSC ( Union Public Service Commission ). IAS is an Indian Administrative Service  which is a civil service which has many functions for government bodies. There are many best IAS academies in Chennai they are as follows :-

1) Kamaraj IAS Academy

2) Topper's IAS Academy

3) Shankar IAS Academy

4) Success IAS academy

5) Ganesh IAS Academy

6) Smart leader IAS Academy

I hope you got your answer.

All the best for your future!