| Value | Category | Cases | |
|---|---|---|---|
| 1 | 7th grade | 1941 |
37.9%
|
| 2 | 8th grade (8 preparatory class) | 1611 |
31.5%
|
| 3 | 9th grade (8 after preparatory class, I course) | 1567 |
30.6%
|
| Sysmiss | 35 |