City Education official website. According to the relevant public information, the grades of grade three and grade four can be inquired on the municipal education network according to the information such as the examination certificate number, name and ID number, or you can find a class teacher at school. The four tones in junior high school refer to the four academic proficiency tests in junior high school, which are generally conducted at the end of each semester or at the end of each year. They mainly test students' knowledge level in Chinese, mathematics, English and comprehensive quality, and are regarded as an important test in junior high school.