Dear Lakshminarayan,

Some of the good coaching institutes in Tamil Nanu for IAS or for Bank exams in Tamil Nadu can be listed as below :

Brilliant Tutorials

Arise Brilliant Chamber

Shankar IAS Academy

Altius IAS Study Circle

Bharathi IAS Study Centre

Dronacharya IAS Academy

Christ UPSC Academy

All India Civil Services Coaching Center

Hope this helps !

i have attched the link below about the best coaching institutes in tamil nadu.

https://www.quora.com/What-IAS-academy-is-the-best-in-Tamil-Nadu

See be clear, if you  want to be a civil servant than go for IAS exam, if you like account management, than go for Bank exam. i have attached a link below. it is the book written by Mrs. ila tripathi. you can go through it. she has explained it very well how to prepare for IAS exam.

https://www.amazon.in/71-51-Journey-Failure-Success-ebook/dp/B07G2SBQNN

This book is available free on kindle store

thanks

Below are the best coaching institutes for IAS preparation

Arise Brilliant Chamber

Altius IAS Study Circle

Bharathi IAS Study Centre

Dronacharya IAS Academy

Brilliant Tutorials

Christ UPSC Academy

All India Civil Services Coaching Center

Shankar IAS Academy

Sure Success Academy

University Of Madras, University Of Madras, Institute Of Correspondence Education

NICE-IAS

Whether to prepare for Banking or IAS it's totally depend on you and your interest. Both are goverment exam and both have good scope.

All the best!!