can i apply ews in state counselling even if i didn't apply ews in neet form

Once you fill in your application form, the last chance to make any corrections in your application form is the correction window. Once the correction window has been closed and even the examination has been conducted, you can't make any changes. Even the merit list has been prepared based on your score in the examination and the category that you have entered in your application. So, your category can't be changed anymore after the results have been declared. To be Frank, you cannot change your category once the results have been declared. You'll be treated as general category candidate.