| Value | Category | Cases | |
|---|---|---|---|
| 1 | 7th grade of elementary school | 638 |
38.5%
|
| 2 | 8th grade of elementary school | 586 |
35.4%
|
| 3 | 1st grade of high school | 433 |
26.1%
|
| Sysmiss | 8 |