| Value | Category |
|---|---|
| 0 | Pre-School |
| 1 | Std 1 |
| 2 | Std 2 |
| 3 | Std 3 |
| 4 | Std 4 |
| 5 | Std 5 |
| 6 | Std 6 |
| 7 | Std 7 |
| 8 | Std 8 |
| 9 | Form 1 |
| 10 | Form 2 |
| 11 | Form 3 |
| 12 | Form 4 |
| 13 | Form 5 |
| 14 | Form 6 |
| 15 | University 1 |
| 16 | University 2 |
| 17 | University 3 |
| 18 | University 4 |
| 19 | University 5 & above |
| 20 | None |
| 21 | Other |
| 25 | Not Stated |
| Sysmiss |