| Value | Category |
|---|---|
| 0 | NEVER ATTENDED SCHOOL |
| 1 | STND 1 |
| 2 | STND 2 |
| 3 | STND 3 |
| 4 | STND 4 |
| 5 | STND 5 |
| 6 | STND 6 |
| 7 | STND 7 |
| 8 | STND 8 |
| 9 | FORM 1 |
| 10 | FORM 2 |
| 11 | FORM 3 |
| 12 | FORM 4 |
| 13 | FORM 5 |
| 14 | FORM 6 |
| 15 | UNIV 1 |
| 16 | UNIV 2 |
| 17 | UNIV 3 |
| 18 | UNIV 4 |
| 19 | UNIV & ABOVE |
| 20 | TC YR 1 |
| 21 | TC YR 2 |
| 22 | TC YR 3 |
| 23 | TC YR 4 |
| Sysmiss |