Math Class Difficulty and FInding the Right Class

I guess I’m still lost - why is it so important to be in calculus 1 in 9th grade. What are you plans for math in 10-12th grade? Don’t neglect other subjects to get ahead in math (not saying you are) since colleges care about more than just stem classes.

If your current class is alge II/precal combined it sounds like it moves faster than just a precal class and both will have you prepared for Calculus next year or am I missing something?