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.
Weird. I'm in Nova Scotia and we had elementary (primary to 6th), junior high (grade 7-9) and high school (grade 10-12), then college or university. Didn't Ontario used to have grade 13 as well?
Used to. Now it's optional. People call gr13 the "victory lap", and it's primarily to give students an opportunity to get their grades up before applying to universities.
Grade 13 (called OAC when I was in high school) was not optional for university entrance, it was required. You could attend college with grade 12 but not university.
Same, but we have middle school where I am. It's grades 6~8 or just 7 and 8 depending on who you ask.
But primary and secondary are also recognized and used in some official circumstances. Tertiary is something I've heard only once, and I'm surprised it doesn't get used more often.