Can we stick to the OP’s original question, please? This is a freshman being told his/her entire college future depends on staying in the highest level math course.
My opinion is that your ultimate goal should be to understand whatever math you end up taking. If the highest level math is completed with an okay grade, but you don’t “get it”, you will just be borrowing more trouble.
And, being a freshman, you might have other options during high school years to do some catch up work in math. But don’t feel you have to “double up” in other subjects. Do what you can academically, find some passions you can delve into, volunteer where you feel you can make a difference, and find some ways to back away from the stress of it all.
Best of luck to you, OP !!