Hi Jayasurya

Some good private and Government colleges in Tamil nadu are:

1. Vellore institute of technology

2. S.R.M institute of science and technology, Chennai

3. National Institute of Technology, Tiruchirapalli

4. Anna University, Chennai

5. Indian institute of technology, Madras

6. Karunya institute of technology and sciences, Coimbatore

7. Coimbatore institute of technology

8. P.S.G college of Technology, Coimbatore

9. Government college of Technology, Coimbatore

10. Sastra University, Thanjavur

11. SRM Engineering college, Kanchipuram

12. College of engineering, Anna University (CEG), Chennai

13. Kongu Engineering college, Erode

14. Kumarangu college of Technology, Coimbatore

15. Velammal college of engineering and technology, Madurai 

All The Best!!