Hello aspirant, as you mentioned that your domicile and Category certificate are not of the same state.

But If you want to seats in State quota of your respective state than you must have residential and caste certificate both certificate must be issues  of same state. You can apply from CSC of your locality.

JoSAA 2020: List of Documents to be Uploaded for IITs

Here is the list of documents to be uploaded for admission in IITs -

Class X Mark Sheet/Certificate or Birth Certificate (for Date-of-Birth)

Class XII Mark Sheet (Qualifying Examination)

Crossed Bank Cheque copy / Image of Passbook with bank account details

Medical Certificate

Certificate of category (SC/ST/OBC-NCL/GEN-EWS), if applicable

In case of OBC-NCL/GEN-EWS category, the certificate must be issued on or after April 01, 2020.

. Original Certificate for Persons with Disabilities (PwD),

OCI/PIO card

Passport / Citizenship certificate, if applicable

Category Certificate (SC/ ST/ OBC-NCL/ Gen-EWS)

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The documents list mentioned above are mandatory, and the candidates will have to make sure that he/ she attends the certificate verification with all the required documents.

All the best!