| Value | Category |
|---|---|
| 1 | Grade 1 |
| 2 | Grade 2 |
| 3 | Grade 3 |
| 4 | Grade 4 |
| 5 | Grade 5 |
| 6 | Grade 6 |
| 7 | Grade 7 |
| 8 | Grade 8 |
| 9 | Grade 9 |
| 10 | Grade 10 |
| 11 | Grade 11 |
| 12 | Grade 12 |
| 20 | Certificate |
| 21 | Diploma not completed |
| 22 | Degree not completed |
| 23 | Diploma |
| 24 | Degree |
| 25 | Above degree |
| 26 | Literacy campaign |
| 95 | Literacy campaign |
| 96 | Other non formal |
| 99 | Nr |