Fyi: it’s called post secondary because, I think, UK calls it primary, secondary, and after that is post secondary.
Czech Republic, and it’s pretty much the same as Slovakia (and perhaps other countries around here.)
Základní škola (elementary, ages ~6+), Střední škola (high school, ages ~15+), Vysoká škola (college, ages ~19+).
Střední škola is sometimes replaced with 4 or 8 years of Gymnázium starting after ZŠ (4-year G.) or after 5th grade (8-year G.) Střední škola is normally focused on a particular field, whereas Gymnázium is more generic and is normally followed by Vysoká škola.