It takes admission through TNEA. 

You can check the eligibility criteria below for engineering program

-The Higher Secondary Examination of ( 12th) Curriculum (Academic Stream ) prescribed by the Government of Tamil Nadu with Mathematics, Physics, Chemistry as three or four subjects of the study prescribed under part III or any other examination of any university or authority accepted by the syndicate of the Anna University as equivalent thereto.

- The candidate shall have not completed 21 years of age as on first of July of the year of application . For candidates belonging to SC/ST the age limit is relaxable by three years.

Good luck!!