The online racing simulator
Nations World League Season 3 Championship Standings
General point scale

The general point system is a linear point system with 40 championship points awarded to the winner and 1 championship point awarded for a 40th place finisher. So the runner-up receives 39 points, the last podium spot 38 points, a 10th place finisher 31 points and so on.
f(p)=41-p

Position / Points
1 / 40
2 / 39
3 / 38
4 / 37
5 / 36
...
40 / 1

In events that are composites of multiple sessions each session awards points for the respective position, however multiplied by a factor, every event scores the same amount of points. For the opening round of a time trail session and a race session, the points are halved for each, for the third round with the XF GTI at Westhill National the points for each race will be split into thirds. For the rallycross round and the "Race of Champions"-style head-to-head event the final standings are taken for the points.

Points are awarded for finishing at least 75% of the (winner's) race distance.

NWL Driver's Cup points

The Driver's Cup points are scored as per the general point scale. The cup winner is the driver with the most points scored throughout the season, however the worst two results will be dropped. Not competing in a round equals scoring zero points. The usage of a national skin will be awarded with an additional bonus point.

NWL Championship points

The Nation's World League Championship is contested by the nations represented by the drivers. The best 50% of the drivers will be averaged, however when two drivers compete, both results will be averaged. To compensate the decrease in the maximum number of points with more drivers included to the average, bonus points are awarded.

Number of racers / Number of racers counted in average / bonus points
1 / 1 / 0.0
2 / 2 / 0.5
3 / 2 / 0.5
4 / 2 / 0.5
5 / 3 / 1.0
6 / 3 / 1.0
7 / 4 / 1.5
8 / 4 / 1.5
9 / 5 / 2.0
10 / 5 / 2.0
...

The usage of one national skin will be awarded with an additional bonus point per driver using it, if all are using it.

If this point system had been in use for Season 2, the title would still have been on the line in the final round and the title would have eventually been won by Lithuania.
I updated the opening post rephrasing the information to hopefully make them more digestible.

FGED GREDG RDFGDR GSFDG