hello priyanshu !!

the format of obc-ncl would be either of the format that is given in jee advance 2019 brochure or the default one issued when we request Jan Seva Kendra.

the obc ncl certificate is valued for only one year.so make sure that during counselling dates the issued which you have is valid and last date for that certificate is still there.

make sure that you take original full length certificate during counselling.

thank you