| 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 |