Being college students we usually play on college lan. Is it somehow possible that we have a local ranking system for just the players connecting to our local servers?
If you want to run an external local ranking system, you should give a try to rankade, our ranking system for sports, games, and more.
It's free to use and it's designed to manage rankings for small or large groups of players. We've got many group using it for Smash Bros, League of Legends, Dota, Fifa, CSGO, and more. Rankade can manage any kind of match: one-on-one, faction vs. faction (two teams, which may be asymmetrical), multiplayer, multi-faction, cooperative games, single player games, and so on.
Rankade doesn't use Elo, as CSGO ranking do, but its algorithm (called ree algorithm), although more complex, is similar to Elo. Here's a comparison, and here's the link for our dojo, where you'll find links to some of our featured public groups.
This should do the trick, and let you and your friends have your own local rank system. Of course, you'll need to play on the same dedicated server instance from that point on.
The Simple CSGO Ranks sourcemod plugin was developed for people who don't want to go through the hassle of either paying for a ranking system like GameMe or using the ingame MM ranking system. It has a focus on storing information which can be used to generate player statistics along with ranking.
By Default: Everytime a player gets a kill their rank increases by 5. When a player is killed their rank decreases by 6. When a player assists a kill their rank increases by 2. When a player is much lower rank than the player they killed the numbers are 10 and 11. When a player defuses the bomb their rank increases by 5.
It also has modes for deathmatch and free for all game modes.
For those who also want to get involved or have up to the minute versions the GitHub repo is here.
It should contain all of the information required to help you set it up on your own server! It should be as easy as setting up Sourcemod, MySQL and putting the plugin into the plugins folder ;)