| GRADE | MARCH 2018 | MAY 2018 | DIFFERENCES |
| A (80 - 100) | 1 | 4 | +3 |
| B (65 - 79) | 5 | 10 | +5 |
| C (50 - 64) | 14 | 10 | −4 |
| D (40 - 49) | 10 | 6 | −4 |
| E (0 - 39) | 0 | 0 | 0 |