Common term in North America for elementary (usually ages 5-12) and secondary (age 13-18) education. What do you call it where you live?
The more common nomenclature is P-12. Pre-school has been accepted and included as "school" for a while under public education funding in many areas.
in the united states the terminology is reversed. "kindergarten" starts at age 5 for one year before school. "preschool" is everything before kindergarten. so there it's pre-school as in not-school, whereas elsewhere it's pre-school as in the year just before school.