For physics: it is most useful for physics, and most physical calculations should be solved by mathematics, mainly because choosing a good mathematical method can reduce the time for solving problems. For chemistry: only use the simplest mathematical calculation, use estimation. For biology: in high school, heredity only uses the knowledge of permutation and combination of elementary mathematics. If it is a university, you need to use mathematics everywhere. Except for mathematics majors, most science and engineering students only need to master the conclusion, not the analysis process.