My S25 is in AP Calc AB this year as a junior. Similar story. Advanced math since middle school. Some Bs here and there for quarters but usually ends with an A overall. Took Honors Pre-Calc last year and did an A.
This year, quizzes and tests were coming in as Ds. School did not offer any alternates other than taking the L on his transcript. We did not want to do that and S25 did not want to give up. He was quite frustrated, too. Hired a tutor which we’re using 1-3x a week now, as needed. Does Kahn Academy on his own, too. He’s now doing As and Bs for the most part, holding at a B- overall which we hope trends higher before the semester ends in a few weeks.
I think the one-on-one time with the tutor has really helped him to break down and understand the concepts. His class size is small, about ten, but having the ability to have the focused attention of an expert has been key. (Background: The school only offered two paths from honors pre-Calc, AP AB or AP Stats.)
A friend’s S25 was in a similar situation, but for a dual enrollment Calc AB class at a local community college. Ultimately, he wanted to pull out and take the hit to his transcript. College acknowledged he was ill-prepared for the class. He had never taken pre-calc and was in IB math previously. His parents allowed him to drop out, but are worried about college impact.
It’s a tough situation and I hope you find the path that’s right for her.