Ask the math test center of Beijing senior high school entrance examination to explain in detail what level of knowledge abc stands for.
Only take compulsory courses, not elective courses. The test paper adopts a hundred-point system, and the results are published in four grades: A, B, C and D. A, B and C are qualified grades, and D is unqualified grade. Grading standards for each grade: A with a score above 85, B with 84-70, C with 69-60, and D with a score below 60. ..