| Value | Category |
|---|---|
| 0 | 0. PRE-NURSERY |
| 1 | 1. NURSERY 1 |
| 2 | 2. NURSERY 2 |
| 3 | 3. NURSERY 3 |
| 11 | 11. PRIMARY 1 |
| 12 | 12. PRIMARY 2 |
| 13 | 13. PRIMARY 3 |
| 14 | 14. PRIMARY 4 |
| 15 | 15. PRIMARY 5 |
| 16 | 16. PRIMARY 6 |
| 21 | 21. JS1 |
| 22 | 22. JS2 |
| 23 | 23. JS3 |
| 96 | 96. OTHER (SPECIFY) |
| 98 | 98. DON'T KNOW |