| Value | Category |
|---|---|
| 10 | not literate |
| 21 | literate without formal schooling: through attending NFEC |
| 22 | through attending AEC |
| 23 | through other means |
| 30 | literate but below primary |
| 40 | primary |
| 50 | middle |
| 60 | secondary |
| 70 | higher secondary |
| 80 | graduate and above |
| 90 | invalid |