I can't recall about here in Australia - I did Chemistry as an elective in the final 2 years of high-school, but I can't recall if everyone did that kind of thing in chemistry in earlier years or not.
...but you also have to remember that high-school was a long time ago for a lot of people, and facts like what the prefix "di" means is hardly something most people are going to need to keep in their heads, so are likely to fade over time.
When I was in high school (graduated in 2006), we were only required to take chemistry OR biology, but not required to take both. Those in my class who were afraid of math (most of them) took biology, while the rest of us enjoyed our chemistry fun.
...but you also have to remember that high-school was a long time ago for a lot of people, and facts like what the prefix "di" means is hardly something most people are going to need to keep in their heads, so are likely to fade over time.