No.You can not make the corrections in your application form further. NTA extended the date of correction till July 20  and that is passed.It is clearly mentioned in official website of NTA that,students have to carefully re correct their application forms  because no more further corrections will be done.

No, now you won't be able to change your category from General to OBC. There was only one way to do that and that was JEE main correction window and that has passes.
Had you entered your category as OBC and you would want it to change it to general then it would have been possible to get change.
Don't loose hope and prepare well ao that you can grab the seat using general quota.
Goodluck

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