| Value | Category |
|---|---|
| 00 | Did not complete standard 1 |
| 01 | Standard 1 |
| 02 | Standard 2 |
| 03 | Standard 3 |
| 04 | Standard 4 |
| 05 | Standard 5 |
| 06 | Standard 6 |
| 07 | Standard 7 |
| 08 | Standard 8 |
| 11 | Form 1 |
| 12 | Form 2 |
| 13 | Form 3 |
| 14 | Form 4 |
| 15 | Form 5 |
| 16 | Form 6 |
| 17 | University not completed |
| 18 | Completed university |
| 98 | Unknown |
| 99 | NIU (not in universe) |