| Grade | Scale | Scale 2 | Grade Description | US Grade |
|---|---|---|---|---|
| Ex | 90,000 - 100,000 | 10,000 | Excellent | A+ |
| A+ | 80,000 - 89,000 | 9,000 | Very Good | A |
| A | 70,000 - 79,000 | 8,000 | Good | AB |
| B+ | 60,000 - 69,000 | 7,000 | Reasonably Good | B |
| B | 50,000 - 59,000 | 6,000 | Average | BC |
| C+ | 40,000 - 49,000 | 5,000 | Satisfactory | C |
| C | 30,000 - 39,000 | 4,000 | Marginal | C |
| S | Satisfactory | S | ||
| Re | 0,000 - 29,000 | 0,000 | Reappear | F |