Migrant workers can do the semi-skilled jobs just fine. Actually better. The way it is now, the migrants would dominate those manufacturing jobs if it weren't for barriers to entry like labor unions, language differences, and ofc the difficulty of immigration.Wrong again. Most high school kids are not taking calculus or art history. I sense a Marie Antoinette syndrome here. Skilled manufacturing are not unwanted jobs, but needed jobs as it brings in ancillary industries as well. You are confusing service jobs that pay little and attract migrant workers for skilled and semi-skilled jobs that pay a considerably higher wage.
Schools suck because they're behind the times and teach at a slow pace. For example, the whole math curriculum is set up around calculus, as if it's the 1960s, instead of more practically useful things like probability, statistics, and computer science. It's still heavily weighted towards humanities. They think they can go into the future with blind integration of tech like iPads when the top private schools do best with pencil and paper. And the kids have no respect or sense of responsibility for whatever reason, which seems to be less of a problem the poorer the country is.