While I sympathize with the situation especially related to the History of Mexico (my kids were somewhat unprepared for South Carolina history when we moved here some years ago) and I imagine Mexico has a different take on the Spanish-American war, too). Nevertheless, trig and physics is just math which translates very well across any language. You either have an aptitude for it or you don't. Dont know the metric system ... you've got to be kidding ... that doesn't pass the laugh test ... at least not mine.
