Hello aspirant,
I am here for helping you...
by considering your doubt I am informing you that if you are belonging from OCI category, and preparing for IIT then you need to have citizenship certificate of your country and you need to have o c i card,
Still o c i card is not mandatory but for that you need to have your citizenship certificate and should have a proof so that you could say that you are belonging from OCI category,
For OCI category student fee structure is different for IIT exam and seat reservation is different than Indian citizen.
I hope it will be beneficial for you....
For more queries you can  upvote my answer and can ask in the comment section below...

Best of luck...

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