Hello ,

Yes it is mandatory to confirm your seat

if you dont go to the college which is alloted with certificate you will loose that seat , go and confirm that seat , then participate for special round , if you get seat in special round you can go and cancel the admission and join the college you have got for special round

But if dont confirm the seat then participate in special round and didnt get any seat then this particular year you will have no seat and will have to repeat 1 whole year again , so dont take such risk , so confirm your seat , then participate for special rounds if you get seat through it then its good if not also you will have the confirmed seat with you

Hope this helps you ,

Best wishes for your future