Ipce exam form - pin number ?

You can fill any 4-digit number like 1234, 4567 etc..Its your wish. But remember that PIN, which will be useful later.

it is  nothing but a password like that

you have to give any four numbers say 4517,7458, like wise

but remeber it 

the same will be required for downloading admit card and for also on results time

Thank you Krishna and Ganesh.