Sorting Into Groups

[Sacrifice]

Well, on my forums we're going to have a point system, which allows the team with the most points win (every 2 months), And I already know about the point hack, the problem is is sorting them into the 3 groups.

I'd either:

-Make a quiz that determines how they'd be sorted.
(which i don't know how to do..)

- Random Sort them (not the best idea)

- Or is there anyway that i could make it so that when a member first joins they see an option in the forum that'll be an introduction one, and they can only see the thing that they'll be sorted, and after there sorted, they'll be able to see the introduction forums. Am i making sense?

Please help if you do know.

[Sacrifice]

sorry, but $bump.