What country are you from and do you call it 1) elementary, junior high, high school 2) elementary, middle school, high school, 3) primary, ???, secondary?
Fyi: it's called post secondary because, I think, UK calls it primary, secondary, and after that is post secondary.
Uk.
Its primary school then secondary school.
Primary school is 6 years "full time" (5/6 years old to 11/12 years old). There are pre-school and "reception" years.
Secondary school is 5 years, with an optional extra 2 years.
Anything beyond secondary school is uni/college/apprenticeship/life
I found secondary school year 6/7 to cover the majority of the foundation of 2 years at Uni (ie, maths, physics, chemistry had a huge amount of repitition before building on it and specialising).