| Value | Category |
|---|---|
| 0 | |
| 1 | None |
| 2 | Primary school uncompleted |
| 3 | Primary school |
| 4 | Lower secondary school (one / two years lasted) |
| 5 | Secondary school(three years lasted and skilled) |
| 6 | Secondary school(four years lasted and highly skilled) |
| 7 | Gymnasium |
| 8 | Higher school (college) |
| 9 | Faculty |
| 10 | Specialization or masters degree |
| 11 | Doctor of science |