Taking SAT/ACT Tests in December

<p>I have a couple of schools that have deadlines at 12/1 and another at 12/15. My latest deadline is 1/15 and the rest are at 1/1. If all the schools still accept SAT/ACT scores from December testings, what happens if they don't receive the official score reports from collegeboard before the application deadline? Do they not look at your application until everything is sent? Should I "rush" scores? I'd be grateful for any help. Thanks.</p>