According to Tamilnadu NEET domicile criteria, your parents nativity will be considered in your favour if you are a native of Tamilnadu but studied from 6th to 12th outside Tamilnadu. In such cases, parents Birth Certificate/SSC Certificate/Ration card can be looked in for authentication. Now, you have your complete education outside Tamilnadu. And permanenet residency certificate is not considered instead of nativity certificate. So unfortunately you cannot claim Tamilnadu's State Domicile for NEET. For complete information on Tamilnadu NEET counselling, please visit our page at: https://medicine.careers360.com/articles/tamil-nadu-mbbs-admission