Why should ABC's differential physical examination have supplementary records?

In the original recruitment plan, some people failed the physical examination, or did not register for the post after the physical examination, resulting in job vacancies.

Differential physical examination means that the number of people participating in physical examination is greater than the number of recruits. If the 100 people recruited at the beginning fail the physical examination, or do not register after the physical examination, there will still be vacancies in the bank. At this time, candidates who pass the medical examination will be admitted.