I didn't even know what a matrix was until I got to college, and I went to a supposedly well-ranked high school and was on the higher level math track. This was

I didn't even know what a matrix was until I got to college, and I went to a supposedly well-ranked high school and was on the higher level math track. This was about 10 years ago. I think some of the education reform might've removed concepts altogether instead of actually improving the presentation? Though I suppose in order to present things well you might need to cut back on the total number of topics covered, I'm not sure I'd describe what I did learn as well-presented either.