Interviewer instructions
Column 13: Highest grade or year of teaching passed.
For people 7 and older, indicate the highest grade or year of instruction that they have passed, accompanied by the first letter corresponding to the level of instruction. For example: 3P (third grade of primary); 5S (fifth year of secondary); 0U (college preparatory); 2U (second year of college); 4E (fourth year of special).
[p. 19]
Special instruction corresponds to the instruction received in schools and academies, for example: business academies, graphic arts schools, trade or technical school, radiotelegraphy schools, and other similar schools.