The use of 'A' level math is to be able to chop people at the application stage.
I don't have a level math and yet here I am flying for a large uk charter company.
As long as you know how to use formula for some of the equations then it shouldn't be a problem.
In everyday flying life it's generally simple addition or subtraction
Don't feel that you need to become a math professor to become a pilot.
Go to a flight school and ask for some advice and be determined.
Good luck.