| Value | Category | Cases | |
|---|---|---|---|
| 1 | VII grade (7 form) | 683 |
35.1%
|
| 2 | VIII grade (8 form) | 639 |
32.8%
|
| 3 | IX grade (9 form) | 624 |
32.1%
|
| Sysmiss | 47 |