| Value | Category | Cases | |
|---|---|---|---|
| 1 | Grade 6 | 504 |
30.5%
|
| 2 | Grade 7 | 438 |
26.5%
|
| 3 | Grade 8 | 415 |
25.1%
|
| 4 | Grade 9 | 296 |
17.9%
|
| Sysmiss | 19 |