Calculus requires a comprensive knowledge and understanding of algebra, geometery, and trigonometry as prerequisite. It is not possible to understand calculus without understanding those other subjects first.
Most, if not all school systems also require that students take another year of precalculus as a prerequisite, before allowing them to take either AB or BC.
Calculus is not even generally taken by most high school students and when it is, it is generally a 12th grade subject.
In recent years, there have been calculus offerings at the middle school level, but this is strictly AP territory, something that would involve the top 1% of students and it is probably being done in around 10 to 20 school districts in the whole country.
Absolute implausible that calculus would have been taught to non-high schoolers prior to a very short number of years ago.
You didn’t study calculus in MS - and honestly, it’s a bizarre thing to claim.
I’m sorry that you lacked the moral fortitude to resist obeying illegal orders (hypothetically), but none the less, I will once again thank you for your service. I know you don’t want thanks, but I feel gratitude just the same.
An employee dying costs a ton in terms of recruiting, trying, lost productivity and revenue. Perhaps you’ve never been in a position of leadership understand this.