A variety of grading systems are used in U.S. education. Below is the grading system found to be most commonly used in public schools: (Letter Grade / Percentage / GPA)
Grading Scale via kwout
Some schools do hand out E letter grades instead of an F, but they are in the minority. Over the years, the letter grading scale became popular across colleges and high schools alike.
As per Businessinsider.com, a lot of schools skipped "E" and went straight to "F" as it simply stands for “fail.”
Are you feeling down about your grades? It is easy to get the blues when you receive low scores on a big test or a homework assignment, but you can't let poor performance get you down. There is always time to make things better.
Check out some tips that can help improve your grades at About.com.