What online courses you take? Do those courses go on your transcript or is it just a summer course for students who need help from that subject?
Stop moving up in math, you’re clearly too accelerated for your skill level. I’d withdraw from Calc if I were you. Brush up on precalc and then try again. If you were able to go from a C in class to an A online but continue to get Cs in math in school, this online class might not be rigorous enough. Being able to get an A in Calc AB is more important than getting to multivariable in high school.
Retaking all bad math grades online is not a good idea. The one pre-calc class? Fine. But the idea of taking the class doing poorly and taking it again is not fine. Slow down and figure out what’s going wrong.
To answer your repeated question if you continue this trend and don’t improve you SAT score no you do not have a shot.