1. Grading system in western countries Schools, colleges and universities in many western countries commonly use letter grades to indicate the quality of a student's academic performance: A excellent= above90B(g。。d=80~89) Average=70-79,D below average =60-69 and F failingebelow 60).1. Grading system in western countries Schools, colleges and universities in many western countries commonly use letter grades to indicate the quality of a student’s academic performance: A (excellent=above 90), B (good=80~89), C (average=70~79), D (below average =60~69), and F (failing=below 60)