D21 is daughter graduating in 21.
DE is taking community college course for colleges credit (which may or may not transfer to your 4 year college) and receiving HS credit. At is common with public high schools; less common at private.
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What you do is you approach the colleges nearby that may have the course(s) you want. They will almost always agree to your taking one class/semester in your senior year, for free, with the consent of your high school.
If is possible to engineer this to take a class at each of several colleges in your area, if you want/need to.