Hey everybody,
I am taking the SAT one last time in December and the results won’t come out until Dec 29th. I know that the application is due Jan 1st, so my question is would I stil have time to send my SAT score ? Or should I apply earlier and then send my SAT scores later ?
Any response will help !! 
You should pre-designate which schools your test is to be sent to BEFORE you take the SAT.
^^Bingo. With CMU you have to report everything so definitely include them as a school which will automatically receive your results. That’s the fastest way to get the scores to them (and you can’t beat free). CMU accepts Nov. scores for ED; therefore it’s reasonable to expect that they will accept Dec. scores for RD but you should call to make sure. You should be able to apply earlier than Jan. 1 - just indicate RD and let them know that another set of scores is on the way.