| Value | Category |
|---|---|
| 0 | Pre-primary |
| 1 | Grade 1 |
| 2 | Grade 2 |
| 3 | Grade 3 |
| 4 | Grade 4 |
| 5 | Grade 5 |
| 6 | Grade 6 |
| 7 | Grade 7 |
| 8 | Grade 8 |
| 9 | Grade 9 |
| 10 | Grade 10 |
| 11 | Grade 11 |
| 12 | Grade 12 |
| 13 | Technical/vocational |
| 14 | Year 1 |
| 15 | Year 2 |
| 16 | Year 3 |
| 17 | Year 4 |
| 18 | Completed undergraduate |
| 19 | Post graduate and above |
| 99 | Missing |