Hi Dinesh, you can get admission through jee-main by applying in the counseling process.if you don't take counseling then they also accept directly admission on the base of jee-main rankings.

if you wanna know about the Colleges Tamilnadu then check it out given link:
https://engineering.careers360.com/colleges/ranking/top-engineering-colleges-in-tamil-nadu-accepting-jee-main-score

good luck