PROSKILL SCORE EXPLAINED
Essentially, your ProSkill score is a “ranking” measurement of your driving ability. It is a weighted system, meaning the higher your opponents scores the better chance you have to gain points; conversely, if you have a higher score than those you are racing with, you are at a higher risk of losing more points.
Everyone starts initially with 1200 points. As you race, you accumulate points based on finishing results, according to your fastest lap time. You are scored against the other racers in your particular race, and the amount of points you are awarded, or lose, is based on the skill (ProSkill score) of the other drivers as well.
It is a weighted scoring system, so for example, if I have 5200 ProSkill points and you have 1300 ProSkill points and we race. If I were to lose to you, you would take a substantial amount of points directly from my ProSkill, something like 120 points. Conversely, if I were to beat you, I would only get maybe 2 or 3 points. Much like if I were to beat Sebastian Vettel in an F1 race it would be in the news world-wide because I am a nobody in the racing world and not expected to beat someone with so much experience. If however, he beat me, it probably wouldn't even make the local monthly newsletter.
Each racer is given 5 points every time they start in a race. This encourages racers to get out there and race even if no one else is in the race. We could assume that each racer would slightly improve their skills with each race.
Now, throw 12 people in together and do the math on all the calculations on who is beating who. Roughly, the top half will gain points and the bottom half of the grid will lose points. This is a rough estimate because there can be upsets such as an extremely high ranking racer losing to a lot of new racers or visa-versa.
The ProSkill score has nothing to do with individual kart performance, it is purely a driver ranking (performance) score.