If you take the unified examination in the city, it should belong to the recruitment of public institutions, which is basically the same as the procedure of civil servants. This is a unified examination of "Basic Knowledge of Public Affairs" and "Administrative Professional Ability Test", which are sold in bookstores. Ask the bookstore owner which version you use there.
If the school hires itself, it depends on what problems the school has. Some students don't need a written test, so they can take the test and tell the class directly. The content is decided by drawing lots.