I sent my AP scores to MIT when I applied; do I need to report them again in order to get credit for them?
No. As long as you listed MIT as a recipient when you took each exam, or requested a complete report from the College Board any credit earned by your scores will be automatically applied. You and your advisor can confirm this when your Online Freshman Advising Folder opens in mid-August. If anything is missing then, you will still have time to report scores before Registration.