A, B, C and D levels. According to official website of Nantong Education Bureau, the comprehensive quality evaluation and ability test scores of Hai 'an in Nantong City, Jiangsu Province are presented in four grades: A, B, C and D, which serve as the basis for students' further education. Among them, 100 to 90 is classified as A, 89 to 75 as B, 74 to 60 as C, and 59 and below are classified as D. Nantong Haimen Senior High School Entrance Examination continues to promote the reform of examination content and methods. Constantly improve the examination evaluation system of "classified examination, comprehensive evaluation" and "combination of process evaluation and summative evaluation", and comprehensively evaluate students from the aspects of comprehensive quality evaluation, academic level test and subject examination.