Do US schools have no streaming? When I was in school (high school, at least---which starts in Grade 9 in Ontario, no Junior High), students were streamed into

Do US schools have no streaming? When I was in school (high school, at least---which starts in Grade 9 in Ontario, no Junior High), students were streamed into classes according to their abilities at the given subject: Basic, General, Advanced, occasionally Enriched. The teacher can't spend 90% of their time on the bottom 10% if the bottom 10% are in another class (where they get 100% of their teacher's time).