I'm glad my east Asian mother put me through Saturday school for natives during my school years in Sweden.
The most damning example I have about Swedish school system is anecdotal: by attending Saturday school, I never had to study math ever in the Swedish school. (same for my Asian classmates) when I finished 9th grade Japanese school curriculum taught ONLY one day per week (2h), I had learned all of advanced math in high school and never had to study math until college.
The focus on "no one left behind == no one allowed ahead" also meant that young me complaining math was boring and easy didn't persuade teachers to let me go ahead, but instead, they allowed me to sleep during the lecture.
The most damning example I have about Swedish school system is anecdotal: by attending Saturday school, I never had to study math ever in the Swedish school. (same for my Asian classmates) when I finished 9th grade Japanese school curriculum taught ONLY one day per week (2h), I had learned all of advanced math in high school and never had to study math until college.
The focus on "no one left behind == no one allowed ahead" also meant that young me complaining math was boring and easy didn't persuade teachers to let me go ahead, but instead, they allowed me to sleep during the lecture.