| 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 |