hehe.. no, it's not a secret
The points rank is as follows:
CTRA Licence + SS Licence + (BnJ Licence/3) where races >=10 and (First Name <> "" and Last Name <> "") and (Nationality <> "" or "None").
The Top Countries criteria includes all players that meet the above criteria, plus that there are 2 or more people from that country. Simple, really
At some point, I may introduce wins and podiums into the criteria, but to do that I need to come up with a formula that makes sense. The strongest criteria at the moment is simply the number of points earned across the X System.
[edit] Importantly, the number of wins/podiums/fastest laps are already built-in, in a sense, because of Becky's points allocation system.. thus wins etc are reflected in the licence points themselves