Make an itemized list of every bill he pays and the amount, with a statement that says he is financially responsible for the items you listed. Then take it to a bank, escrow company or notary service (they can even come to you, look in the yellow pages) with gov't issued ID for both of you. Have both of you sign in front of the notary, they will stamp it and you turn it in. It should only cost a few dollars, if anything at all, and take 5 minutes. It might be a good idea to bring 2 or 3 copies to have notarized, so you can turn in an original and have a backup original in case the school loses it.