| Value | Category |
|---|---|
| 0 | 0. I never went to school |
| 2 | 2. Class2/Grade2 |
| 3 | 3. Std1/Grade3 |
| 4 | 4. Std2/Grade4 |
| 5 | 5. Std3/Grade5 |
| 6 | 6. Std4/Grade6 |
| 7 | 7. Std5/Grade7 |
| 8 | 8. Std6/Grade8 |
| 9 | 9. Std7/Grade9 |
| 10 | 10. Std8/Grade10 |
| 11 | 11. Std9/Grade11 |
| 12 | 12. Std10/Grade12 |
| 99 | 99. I cannot remember |