100 points refers to the standing long jump of that class. The full marks of 1000m and 800m are 100. For example, if you run at 1000m for 3 minutes and 40 minutes, your 1000m will get 100 points. The same is true of the standing long jump.

If you still don't understand, interpret 100 as a perfect score, and two perfect scores are 70 points.