The four tones, like the meta-tones, are also unified examinations in the whole city and graded by districts. The difference is that the exam adjustment in April was carried out after the release of the instructions for the senior high school entrance examination, which highlighted the examination of the overall knowledge structure.

April, the third day of Wuhan, is the most important big exam before the middle school entrance examination, which is called the "wind vane of the middle school entrance examination". Four tones have a guiding role in signing contracts and volunteering. Therefore, it is the homework that every junior three student should do to know the content of the four tones in advance and get ready.