| Value | Category |
|---|---|
| 0 | None |
| 1 | Pre-school |
| 2 | P1 |
| 3 | P2 |
| 4 | P3 |
| 5 | P4 |
| 6 | P5 |
| 7 | P6 |
| 8 | JHS1 |
| 9 | JHS2 |
| 10 | JHS3 |
| 11 | SHS1/SHTECH1 |
| 12 | SHS2/SHTECH2 |
| 13 | SHS3/SHTECH3 |
| 14 | SHS4/SHTECH4 |
| 15 | ML1 |
| 16 | ML2 |
| 17 | ML3 |
| 18 | ML4 |
| 19 | O-level S1 |
| 20 | O-level S2 |
| 21 | O-level S3 |
| 22 | O-level S4 |
| 23 | O-level S5 |
| 24 | Vocational School |
| Sysmiss |