Hello aspirant!
hope you are doing well,
During counselling of any examination/college one has to submit document during document verification round, a candidate has to submit all the documents.
As notified by the official circular of IP university the last date of submission of class 10th, 11th and 12th certificate along with the reservation certificate was 22nd October.

In case a candidate in unable of submit SC certificate of his/her name , it wont be getting benefit of caste reservation. For more information please refer to http://www.ipu.ac.in/Pubinfo2020/n121020%20(1).pdf