Academic grading in the United States - Wikipedia
https://en.wikipedia.org/wiki/Academic_grading_in_the_United_StatesThe typical letter grades awarded for participation in a course are (from highest to lowest) A, B, C, D and F. Variations on the traditional five-grade system allow for awarding A+, A, A−, B+, B, B−, C+, C, C−, D+, D, D−, and F. In primary and secondary schools, a D is usually the lowest passing grade. However, there are some schools that consider a C the lowest passing grade, so the general standard is that anything below a 60% or 70% is failing, depending on the grading scale…