A+: 93-100%
A-: 90-92%
B+: 87-89%
B: 83-86%
B-: 80-82%
C+: 77-79%
C: 73-76%
C-: 70-72%
D+: 67-69%
D: 63-66%
D-: 60-62%
F: Below 60%