Clash of Clan's-like league system help

What I’d like to do is make a clash of clans-like league system(bronze league, silver league, etc.) but I’m not really sure how to do it. I’ve been following the online leaderboard tutorial on the unity wiki, but I don’t think that will do because it’ll show everyone in the bronze league, silver league, etc instead of having about 25 per group in a bronze league. I’ve been looking everywhere for a tutorial like this but I can’t find any. Please help!!!

Have multiple leagues? Every time someone is at the top of the bronze league for a certain amount of time, move them to silver, etc.

No every time a player reaches a certain amount of points they move up a league