keep the broken one. I suggest calling and asking. I think it's a little dangerous not to stamp it. Although it's okay to hand it over directly to the embassy in the end, in fact, it's not necessary to notarize six copies. It's a waste of money if you look for relatives as collateral, you only need to notarize three copies, one copy for the school, one copy for the notary office and one copy for yourself and the guarantor. Of course, this requires that relatives who have good relations can get rid of it quickly if they don't seal it with the teachers in charge of the school. I got rid of it before going abroad, but I scanned it myself and finally printed a stamp myself.