Hiii

There are a number of good coaching institutions in Chennai. Here is the list for the same:

• venper academy 
• VVT Coaching center adyar
• Axent Academy
• ConceptTree
• Pioneer Academy
• Akash Institute
• Appolo Academy
• NEET academy
• Focus Education
• SK academy
• Extel Academy
  

Venper Academy and Pinoneer are considered to be the top most institutes as the no. of students getting selected every year is high around 80-90% but the other names in the list are also great. 

Other than going to these coaching classes, you can prefer online coaching. Careers360 has made available and online coaching named Entrance360 where you can find all the study material, tests, practice papers, previous year papers, mentors guiding you in right direction and a customised time table for you. It will help you score better marks. Here is the link for the same
https://www.entrance360.com/

Hope this helps
Thanks!!