| Value | Category |
|---|---|
| PRE_SCHOOL | |
| 1 | PASSED_YEAR_1 |
| 2 | PASSED_YR_2 |
| 3 | PASSED_YR_3 |
| 4 | PASSED_YR_4 |
| 5 | PASSED_YR_5 |
| 6 | PASSED_YR_6 |
| 7 | PASSED_YR_7 |
| 8 | PASSED_YR_8 |
| 9 | PASSED_YR_9 |
| 10 | PASSED_YR_10 |
| 11 | PASSED_YR_11 |
| 12 | PASSED_YR_12 |
| 13 | PASSED_YR_13 |
| 14 | PASSED_GAQ_GSQ |
| 15 | PASSED_DEGREE |
| 16 | PASSED_POST_DEG |
| 19 | NO_SCHOOLING |