Poor Math Grades, Mechanical Engineering

I’ve had fairly mediocre math grades in high school so far:

Geometry: A/A
Algebra 2: B/B
Precalc: C/B
Currently taking Calc.

How much will my math grades hurt me if I’m applying for mechanical engineering?

I have a 800 math, 750 writing, 750 cr SAT and a 3.92 UC gpa.

I believe that the 800 in math will make up A LOT for your math grades at school.