| Value | Category | Cases | |
|---|---|---|---|
| 1 | 7th grade of elementary school | 550 |
42.2%
|
| 2 | 8th grade of elementary school | 448 |
34.4%
|
| 3 | 1st grade of high school | 304 |
23.3%
|
| Sysmiss | 12 |