Meh. I go to a foreigner's private school in Korea (PM me for full story), and it follows a nerdier version of typical American curriculum.
(Taken directly from student handbook)
A: 96-100 Excellent
B: 88-95 Above Average
C: 80-87 Average
D: 75-79 Below Average
E: 70-74 Failing
F: 0-69 Dismal
Yes, we actually have a 'Dismal' grade. If you get even one F, you are forced to take after school tutoring for a week. If you have two F's in the same trimester (we have the year split into three, hence 'tri'), then you have to take a month's tutoring. If you get three...expulsion. Sucks...meh.