| Value | Category |
|---|---|
| 0 | None |
| 1 | Grade R |
| 2 | Sub A Gr1 |
| 3 | Sub B Gr2 |
| 4 | Std 1 Gr3 |
| 5 | Std 2 Gr4 |
| 6 | Std 3 Gr5 |
| 7 | Std 4 Gr6 |
| 8 | Std 5 Gr7 |
| 9 | Std 6 Gr8 |
| 10 | Std 7 Gr9 |
| 11 | Std 8 Gr10 Form3 NTC1 |
| 12 | Std 9 Gr11 Form4 NTC2 |
| 13 | Std 10 Gr12 Form5 NTC3 |
| 14 | University / Tech |
| 97 | Unknown |
| 98 | Not applicable |
| 99 | Unspecified |