I remember teaching a juvenile delinquent biology that he had no interest in and was going to drop out at the end of the year. He had absolutely no need to learn that. I didn't remember any of it from high school and don't remember it now. Most of what kids learn in school is useless and getting more so. My last years of teaching in US they were forcing teachers to basically create their own texts which we are not trained to do, spend many hours creating lesson plans and lessons that are not as good as texts or as useful. You need to talk to some teachers about their problems.