Hello tanuj

I hope you are doing good. As per your query, I would glad to inform you that after once you have submiitted the application ,it cant be edited or changed as the forms is locked by nta.

If you have entered obc category then you wil be treated as obc category . However ,If you would fail to proof yourself with original obc certificate you will be changed to general category automatically , your admission will not get cancelled.

Hope you found this answer helpful. Good luck for your future