| Value | Category |
|---|---|
| 00 | Pre-primary/no grade |
| 01 | Grade 1 |
| 02 | Grade 2 |
| 03 | Grade 3 |
| 04 | Grade 4 |
| 05 | Grade 5 |
| 06 | Grade 6 |
| 07 | Grade 7 |
| 08 | Grade 8 |
| 09 | Grade 9 |
| 10 | Grade 10 |
| 11 | Grade 11 |
| 12 | Grade 12 |
| 13 | Technical/vocational |
| 14 | Year 1 of university |
| 15 | Year 2 of university |
| 16 | Year 3 of university |
| 17 | Year 4 of university |
| 18 | Completed undergraduate |
| 19 | Post graduate and above |
| 99 | NIU (not in universe) |