So... School in my country is from 1st to 6th grade, and high school from 7th to 10th. And then you have 11th and 12th which is above high-school but bellow college, also known as bachillerato in my country.
Bachillerato is like Oberstufe then, also the last 2 years.
Tbh 11&12th grade were the best years of school. Still bad. But the rest was just another level of horror.