For the Tamilnadu medical or dental admissions, Directorate of Medical Education is the counselling authority for tamilnadu. The date for the application form was 20 june. Then after the sunsequent rounds of the counselling will start. The merit list will be published by the first week of july and then candidates have to confirm the admission to the seats they have been allotted.Then after the amission for the vacant seats will start. Read the complete info on the link given below.

https://medicine.careers360.com/articles/tamil-nadu-mbbs-admission