| Value | Category | 
|---|---|
| 0 | NURSERY/PRESCHOOL | 
| 1 | PRIMARY | 
| 2 | SECONDARY | 
| 3 | PRIMARY VOCATIONAL EDUCATION | 
| 4 | PRIMARY PROFESSIONAL EDUCATION BASED ON SECONDARY GENERAL EDUCATION | 
| 5 | SECONDARY PROFESSIONAL EDUCATION | 
| 6 | BACHELOR DEGREE | 
| 7 | MASTER DEGREE | 
| 8 | SPECIALIST DEGREE | 
| 9 | CANDIDATE OF SCIENCE | 
| 10 | DOCTOR OF SCIENCE | 
| 888 | DON'T KNOW | 
| 1001 | .A |