My D22 wanted to stick with BC her junior year even though she struggled. I wanted her to drop to AB. My husband said let her stick with BC which she wanted to do. My husband who is a successful financier said he learned so much from taking BC while he wasn’t a math genius.
D’s final grade for BC was B. That pulled her GPA down a lot. We will see soon how her college admissions process goes.
(BTW, multi variable this year is a breeze for her.)