Hello Aspirant,

The merit rank list of the councelling process is prepared by the authorities consider what students have filled in the registration or application form. So, if you have filled it incorrectly and have written EBC instead of OBC then your rank and merit list would be prepared using the information that you have filled.

But, You may contact the concerned authorities during the time of councelling and tell them the problem happened. So,  they would some what do particular measures if possible.

Hope that helps. Good luck