Hello,
Category certificate is mandatory to upload if you belong to any reserved category. Once if you have filled your category in online application form you cannot make any changes later but you can update or replace your category certificate within given time. So you need to look for such notice in the official website http://www.du.ac.in/du/uploads/COVID-19/admissions.html . Meanwhile try to get your category certificate, if it is not possible then you need to apply under general category or seek admission in any other college or wait for next year.
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