The rule of thumb for most schools in the US
90% or above, A
80% or above, B
70% or above, C
60% or above, D
Some schools use +- system, when the % is about +- 3%,
so the 89% is an A-, so as to 65% is about C- or D+
90% or above, A
80% or above, B
70% or above, C
60% or above, D
Some schools use +- system, when the % is about +- 3%,
so the 89% is an A-, so as to 65% is about C- or D+