How to score the direct finals of the first grade 12 class of the school sports meeting?

1. First of all, the playground runways used in the school sports meeting are divided into 12, and the total length of each runway is the same.

2. Secondly, determine the starting point and ending point of each runway, and mark it with 1- 12.

3. Finally, according to the order of drawing lots, just decide the lane of a grade 12 class.