How to run in time in Anhui senior high school entrance examination?

Generally speaking, the running results of the senior high school entrance examination are recorded according to the running time. Generally, when starting before running, they will press the stopwatch, and when they cross the finish line, they will stop the stopwatch, so that the last time displayed is your running performance in the senior high school entrance examination, but the running performance in the senior high school entrance examination will definitely not be recorded by ranking, mainly by running time.