I didn’t understand what is this diamond league, silver league,… etc. I don’t how I traveled from bronze league to diamond league. I want to know how the leagues are given, I mean on which base. And I don’t want to know about XP also… I have seen that I earned 42 XP but I don’t know what is that and don’t know how to increase… after seeing all these I thought I just know about rating and contests in codechef 
. If anyone one know please explain me about these things.