Hello Shay

To get a reservation quota on the basis of your domicile for Tamil NAdu you need to have  a few things. First of all the applicant’s parents or guardian should be a permanent resident living more than 6 years in Tamil Nadu. After that you will need

Permanent residence proof for 5 years.

Copy of ration card, voter ID, sale deed, tax receipt, etc.

School Leaving Certificate.

If you have these documents you can get yourself a domicile certificate.