Two questions...

1) Just wondering, how are the Med groups organized by?

2) From what I understand, you get really close to your Med Group...which is great! But do you really get to know others that may not be in your group well?

I've heard different ways that MED groups were assigned. When I went it was alphabetical by last name. There will be approx 20 kids, plus an advisor (FA) in each group.
Whether or not you really get to know people not in your group depends on you. There will be opportunities, but for the most part, you'll be with people from your group

Why is MED capitalized?

I have no idea. But that's the way I've always seen it