| Value | Category | 
|---|---|
| 0 | Nursery/Pre school | 
| 1 | std1 | 
| 2 | std2 | 
| 3 | std3 | 
| 4 | std4 | 
| 5 | std5 | 
| 6 | std6 | 
| 7 | std7 | 
| 8 | std8 | 
| 9 | form1 | 
| 10 | form2 | 
| 11 | form3 | 
| 12 | form4 | 
| 13 | form5 | 
| 14 | form6 | 
| 15 | univ 1 | 
| 16 | univ 2 | 
| 17 | univ 3 | 
| 18 | univ 4 | 
| 19 | univ 5 & above | 
| 20 | TC Yr 1 | 
| 21 | TC Yr 2 | 
| 22 | TC Yr 3 | 
| 23 | TC Yr 4 | 
| Sysmiss |