There are many reasons for setting up the supernumerary examination, but the most important point may be that the institution is full, and the Ministry of Finance can no longer support the salaries of more people, but there are still many jobs that existing personnel can't complete. Therefore, in order to reduce financial expenditure and meet the current work needs, these units can only solve this problem by increasing supernumerary personnel.

The same position may be divided into supernumerary and internal examination, of course, more candidates will choose internal examination. However, in general, the registration requirements for internal positions are stricter than those for non-government positions. In fact, the supernumerary posts are still very stable. As long as you don't make excessive mistakes during your tenure, it is generally the same as the supernumerary position.