Before any of that, read the book "Div, Grad, Curl, and All That: An Informal Text on Vector Calculus" by H. M. Schey. It will make math of EE, particularly the

Before any of that, read the book "Div, Grad, Curl, and All That: An Informal Text on Vector Calculus" by H. M. Schey. It will make math of EE, particularly the interaction between electricity and magnetism (Maxwell's equations) a lot easier to understand.