Hello Aspirant
If due to any possible reason you have filled your category wrong, you can't change it after the announcement of result.
The only option to change category opens up when the correction window opens up for NEET registration form not the NEET counseling application form. You would have to provide/upload an EWS certificate to avail the benefit of EWS Quota or else you will be considered a general candidate and will be given seat based on that.
Go through the link below to get more information on NEET Counseling:
https://medicine.careers360.com/articles/neet-counselling
Hope this helps
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