Grades. In some areas, the results of the senior high school entrance examination will be divided into several grades. A is the highest level, and Sheng Di refers to two subjects, geography and biology. Double a means that both subjects get good grades of A-level. This classification is called the conversion of the results of the senior high school entrance examination, which means that the results announced in the senior high school entrance examination are not the original, only the results and star ratings of various subjects are announced, and the total results and star ratings are also announced.