| Value | Category |
|---|---|
| 0 | Pre-school or BLANK |
| 1 | Std1 |
| 2 | Std2 |
| 3 | Std3 |
| 4 | Std4 |
| 5 | Std5 |
| 6 | Std6 |
| 7 | Std7 |
| 8 | Std8 |
| 9 | Course after pr |
| 10 | Form1 |
| 11 | Form2 |
| 12 | Form3 |
| 13 | Form4 |
| 14 | Course after sec |
| 15 | Form5 |
| 16 | Form6 |
| 17 | Course after 6 |
| 18 | Diploma course |
| 19 | Other certificat |
| 20 | University |
| 21 | Adult education |
| 22 | No education |
| 99 | NS |