Thank you. That's a great question.
We have high schools in both major cities. All the other schools are combined primary and secondary schools, except in Regina and Saskatoon, which have stand-alone primary schools.
After grade 12, many students would like to continue their post-secondary studies in French, but they can't do so because few institutions offer programs in French after high school. Sometimes the programs simply don't exist. They are therefore inclined to continue their education in other provinces.