I work in a computer service and each time i fill the form for them, they'd ask "what do we do hereafter, is it necessary to post?"
There is no specific requisition for it but people just post. After filling, there is a confirmation message sent via your Phone number indicating successful submission. So if the school is so far you can't post, do not force yourself to post it but like PHLOAT said, be on the safer side by posting it. Thanks.