| Value | Category |
|---|---|
| -999999999 | missing |
| 11 | Std 1 |
| 12 | Std 2 |
| 13 | Std 3 |
| 14 | Std 4 |
| 15 | Std 5 |
| 16 | Std 6 |
| 17 | Std 7 |
| 21 | Form 1 |
| 22 | Form 2 |
| 23 | Form 3 |
| 24 | Form 4 |
| 25 | Form 5 |
| 26 | A level/IB |
| 31 | VOC 1 |
| 32 | VOC 2 |
| 33 | VOC 3+ |
| 41 | VOC 1 |
| 42 | VOC 2 |
| 43 | VOC 3+ |
| 51 | Voc tech 1 1 |
| 52 | Voc tech 2 |
| 53 | Voc tech 3 |
| 54 | Voc tech 4+ |
| 61 | Univ 1 |
| 62 | Univ 2 |
| 63 | Univ 3 |
| 64 | Univ 4 |
| 65 | Univ 5+ |