To the best of my knowledge: * In Israeli high-school the system requires from students to take a number of credits in various disciplines. Some number of cre

To the best of my knowledge: * In Israeli high-school the system requires from students to take a number of credits in various disciplines. Some number of credits for certain disciplines is mandatory, while most are elective. Taking the maximum number of credits in math will include some matrix algebra. Taking maximum math credits isn't uncommon as the school graduation exams will have a major influence on college admission. * In Ukraine the equivalent of high-school is optional: a large fraction of students goes to an equivalent of a trade school instead. For those who stay, the program may vary greatly based on the teacher's own preferences, what they believe would be beneficial for the college entrance exams. So, it could include sometimes even somewhat advanced college-level math, but not necessarily uniformly so. I remember that our algebra teacher put a huge emphasis on solving problems from Skanavi's book (some scary-looking multiple layers of arithmetic expressions that need a lot of effort and creativity to simplify them), but there was very little attention paid to matrices (perhaps only mentioned in the context of linear equations systems).