Teaching of mathematics in secondary schools, comparative study

... there are at the present time three distinct plans of organization of school
systems. In some provinces the first eight grades (or years) of schooling
constitute the primary school, with the succeeding four (or in two provinces, five)
grades constituting the secondary school. Other provinces employ a 6-3-3 plan,
under which the primary school terminates at the end of grade VI, with grades VII-
IX inclusive as the junior secondary school, and grades X-XII as the senior
secondary school.