| 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 |