我只建議最大份量的做法.
編程: https://www.edx.org/micromasters/analytics-essential-tools-methods, 去上一件python and data analytics的online certified course.
Maths: https://netmath.illinois.edu/academics/certificate-program 補一遍calculus I, II, III, Diff Eqn and Linear Algebra.
Links are just example.