Hello Student

It is not mandatory but I have to submit the domicile certificate and caste validity certificate at the time of counselling for IIITs admission. As you are talking about your home State admission caste validity  certificate if you have not got at the  moment you can submit the receipt of application submitted by you for caste validity certificate and an undertaking in the court of law. SC ST candidate can have to get the caste certificate from the competent authority. After that candidate has to  apply for caste validity certificate  to the competent authority.

For more information you can click on the official website of NTA : https://nta ac.in