St. Mary School uses the following grading system as mandated by the Diocese:

• 98% - 100% A+
• 95% - 97% A
• 93% - 94% A-
• 90% - 92% B+
• 87% - 89% B
• 85% - 86% B-
• 82% - 84% C+
• 79% - 81% C
• 77% - 78% C-
• 75% - 76% D+
• 72% - 74% D
• 70% - 71% D-
• 0% - 69% F

NOTE: Grades K-6 use O,S, and U for gym, music, and art.

O = outstanding performance

S = satisfactory

U = unsatisfactory

N = needs improvement