Hi Aspirant,

Hope you are doing great as per the question asked by you,as the form filling and correction dates are over so now you can not change your category from O.B.C to General E.W.S as dates have been gone but you should definitely mail to the required authorities regarding the mistakes you have made. They may provide you some relevant solutions regarding your mistakes.

Hope you found this answer useful. Stay motivated stay positive.

All the best!