There are some schools that required high school to take calculus, that’s why my cousin michelle told my brother to visit the Admission-sevice.com they are website that good in any mathematics problem. Try them too.
Differential calculus is so much easier than the rest of high school math that I thought at first that our teacher was joking with us. Integral calculus gets a bit tricky is spots, but really it’s not that bad either.
Oh, and here’s a thread about Calculus from 10 years ago that I still read quotes from on the first day of class whenever I teach Calculus I.
I didn’t see it explicitly mentioned, but do graphing/plotting of equations and functions on an x-y plane. Graph every equation you can think of, and try to get an intuition for what their graph looks like. Pay attention to where they cross axes, how they’re curved, where they go infinite (or seem to), etc.
e.g.
y=x^2
y=x^3
y=sin(x)
y=tan(x)
y=x^3+3x-5
Being comfortable with plots, graphs, and visualizing the shapes of functions is one of the most powerful skills you can develop. Future math, science, and statistics subjects depend heavily on the ability to translate data into visualizations.
A strong understanding of limits is foundational to calculus.
Also, do all the homework problems–by hand.