NTA information bulletin isn't clear about the fields that you can correct during the correction window. But last year, Candidates were not able to make corrections to the Id proof details. If we have to go by that, you will not be able to correct your Ration Card details. What we would suggest you is to reach out to the helpdesk at: neetug-nta@nic.in (mailto:neetug-nta@nic.in) . Usually they take 24-48 hours to reply. If they say you cannot correct this information, may be then you can fill in another application form with a new email id and mobile no#. The late date to fill in the application form is December 31st and you still have time.