Well that's not surprising, urban public schools, at least in the major American city I'm from, are about figuring out who's a good pencil-pusher as early as possible then segregating them from the rest of the riff-raff until they graduate HS. Most of the cohort I'm talking about likely got invited to a 'gifted' elementary school somewhere around 5th or 6th grade or a 7th/8th grade program attached to one of the top HSs.

I only know this cohort well enough because I was on the debate team which most've them used as an extra-curricular for their college application CV but weren't serious about winning.