General Question regarding quant

Hii guys I had a very general question
I took few mocks and the problem I’m facing is

  1. misreading the question:
    Example if the questions asks me to solve a quadratic equation and to find the values of x-3 or something similar I would find the roots and simply select the value of x instead of subtracting 3 and after the test when I review it I find that I have committed a silly mistake

  2. Calculation error:
    Like missing 0 or simple math calculations like sometimes I take 6*8 as 56 instead of 48 unknowingly or something similar

How should I avoid commiting these mistakes do you guys have any tips ?