Off the transfer info on columbias website:
“We encourage transfer applicants to list all college coursework on their application, including current coursework, but discourage students from listing high school coursework.”
Core HS courses don’t vary much, especially AP classes. The quote you listed references courses not grades. All colleges require HS transcripts but what they really care about college coursework and grades which are a much better indicator of how you’re handling college level academics.
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