To apply for state counselling (TN/Pondicherry) you will have to check the university's official sites and register for the counselling there. For AIQ, you need to register at MCC's official website. The procedure is almost similar for both the cases except that AI counselling is almost always online. Documents required

Birth Certificate

Valid ID proof (aadhar card, pan card, voter ID etc)

Class 10 and class 12 result card and mark sheet

Character certificate from school or other previous institution

TC and migration from previous institution

Character certificate by tehsildar

Domicile certificate if any

NEET admit card

NEET score card

Caste/category certificate

Passport size photos