First of all, I am a freshman. I think the derivative part is the most commonly used part in high numbers, because in the integral operation, it will be applied to the inverse operation of derivative, that is, indefinite integral, derivative of multivariate function, that is, partial derivative and so on.

Secondly, high numbers will also be used in the function part and sequence part of high school mathematics, because in the difference equation, the infinite series part will use some basic knowledge of sequence. Of course, functions will definitely be used, so high school must learn functions well. The function part is the closest connection between high school and university. Basically, the function runs through the whole mathematics learning.

There are also some basic knowledge of vectors and geometry. I think when you go to college, you will know that advanced mathematics is not as advanced as you think, that is, you just learned something new.

Finally, I hope what I said has some effect on you.