| Value | Category | Cases | |
|---|---|---|---|
| 1 | 7th year of elementary school | 281 |
29.2%
|
| 2 | 8th year of elementary school | 362 |
37.6%
|
| 3 | 1st grade of high school | 319 |
33.2%
|
| Sysmiss | 9 |