The last date to make changes to your NEET application form for the Category is the correction window. Once the correction window closes you technically cannot make any changes to your Category or claim its benefits. Unfortunately, you cannot claim EWS reservation now. You might have to opt under General Category only. For a complete list of colleges that you may have a shot at, please use our College predictor: https://medicine.careers360.com/neet-college-predictor?icn=QnA&ici=qna_answer .