A = >90%
B = 80-89%
C = 70-79%
D = 60-69%, sometimes considered a fail
F = <60%, always a fail
Then we also have an overall GPA calculated from our grades. A average = 4.0, B aversge = 3.0, C average = 2.0, D average = 1.0, and F average is less than 1.0. So like I had a 3.9 GPA when I graduated high school, meaning I had almost straight As every semester, but one or two Bs. You can technically have over 4.0 due to extra credit or some bullshit like that, but I couldn't be assed to do any. My day ended and I just wanted to play computer games.
But when I was in kindergarten, we had S (satisfactory), U (unsatisfactory), and F (Fail). I think this is some Colorado thing.
All this ended up meaning mostly jack to my employers.