Our "grades" work like British "years," except off by one, I believe, because of Kindergarten (a kinda/sorta pre-school grade).
We have optional pre-school for very young children, then Elementary School (Kindergarten through fifth or sixth grade, depending on the area), then Middle School/Junior High, then High School (usually ninth through twelfth grade).
So students are usually 18 by the time High School ends. Any additional education (college) is purely optional.
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