Uh call up the college board as soon as possible and get that fixed. A December date for SATs when you are a senior is pushing it considering that most colleges want it by January 1st the latest. I suggeset sending everything, SAT scores, essays, recommendations two weeks before that date just in case there is a delay in snail mail, stuff gets lost (it does happen), and everything else God can do. You might want to consider, like fatalbert mentioned, using the option of sending the scores ASAP but it will cost a bit.