A kid who did a lot of reading would know them by ninth grade or so, when I was growing up.
But there would have been lots of kids who stumbled on them if asked to read them aloud without preparation. Maybe they weren't the kind of kids who would go on to major in engineering or chemistry, but they also wouldn't have been dummies.
Advanced??
More like basic reading for high school grad age.
To me those words are not advanced. I probably learned those in 5th grade. Can you imagine if they had to have the education of early Americans or the English children in the 1800s? Even in my parents generation of the 1940s and 1950s, school was hard. Latin was required. Why it got so dumbed down is appalling.
Oh please.