Yes I will let you some names of coaching centres that conducted IIT preparation for student in Chennai so that you can have idea and remember easily.

Here I have some names of the coaching centre
TRS IIT CLASSES
37/72, 7th Avenue, Ashok nagar, (opp. GRT School Play Ground),, Chennai, Tamil Nadu 600083
Phone:094443 61199

Anugraham Classes
Manikkam St, Ramakrishnapuram, West Mambalam, Chennai, Tamil Nadu 600033
Phone:044 2474 9441

IIT-Jee Coaching Centre
Plot No. 2797, Old Y Block, 12th Main Road, 6th street, Anna Nagar, Chennai, Tamil Nadu 600040
Phone:044 2621 5550

Aakash Institute | Aakash IIT-JEE | Aakash Foundations
K.R.Building No.-12, 3rd Floor, L.B. Road, Adyar Circle, Adyar, Chennai, TN 600020
Phone:044 3945 4545

Velammaliitmedicalfoundation
No.3 Church road,Mogappair east, Chennai, Tamil Nadu 600037
Phone:044 4550 1111

Seekers
52, 1st Main Rd, Vasantha Colony, Anna Nagar, Chennai, Tamil Nadu 600040
Phone:097890 62911

PRAGNA CLASSES LLP
Vedanta Desigar Swami St, Vinayaka Nagar Colony, Mylapore, Chennai, Tamil Nadu 600004
Phone:095000 14341

Aakash Institute | Aakash IIT-JEE | Aakash Foundations
2nd Floor, Building No. 10, 1st Avenue, Ashok Nagar, Chennai, TN 600083
Phone:044 2471 7559

Lakshmi IIT Academy
11th St, Anna Nagar West Extension, Chennai, Tamil Nadu 600101
Phone:044 2615 2287