I think it is important though that there be an appeal process available, as opposed to a hard and fast rule on cutoffs.
In the first semester of my kid’s sophomore year in HS, he had a B+ in his World History class which meant no go for APUSH the following year. My kid pestered the teacher so much about allowing him to take APUSH that he wrote me a note on his persistence. He was actually a real ass about it, insisting that he wouldn’t approve the class no matter what his arguments were. I wrote back that his mother had passed away 6 months prior and that was really affecting everything, something that my kid did not and could not express at the time. I got the teacher to finally agree to re-evaluate at the end of the year. He got an A the second half and was allowed to go onto APUSH.