The list of Government Medical Colleges in Tamil Nadu is provided here. There are about twenty Government Medical Colleges with a sanctioned strength of 2650 seats.
In addition to this there is one Government Dental college and about Seventeen Self financing Dental Colleges in TN.
In the above list, the first three colleges are the top three medical colleges in Tamil Nadu . The next seven colleges can be termed as Tier I medical colleges. Rest of the colleges can be mentioned as Tier II medical colleges. The admission process of all these colleges remain the same.
The All India Quota (AIQ) seats is filled through AIPMT/NEET till last academic year and this year also will be done in the same manner only. Students from throughout India, including TN are eligible to compete in this quota through AIPMT/NEET.
The state quota seats is filled by the state govt admission authorities and till last year admission is based on 12th board marks. Only TN state domicile students are eligible to compete in these seats. This year, (2017 admissions) the admissions will be based on NEET 2017 and not through the board marks. However only Tamil Nadu state domicile students will be eligible for these seats and not other state students.
There is a bit of misunderstanding and miscommunication about the above part. Many people (wrongly) assume that since the admission are done through NEET, other state students also might compete for the state quota seats. It is not so. State government quota remains with the state govt and only the admission process is changed.