You may be right about the students who’ve already had calculus. They are not seen by the community college teacher of an Algebra class. On the whole, community colleges do not get the best students. But point #4 is also relevant, because the additional chances mean that poor students bring down class averages not once but up to three times.
I should point out that the article you referenced also said, “But SAT and ACT scores show that college readiness skills, as measured by these indicators, have not improved significantly.”

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