One can't over emphasise: LA and Calc. Do that! The rest will be a cake walk. But you need LA from matrices to spectral decomposition and Calc from differenti

One can't over emphasise: LA and Calc. Do that! The rest will be a cake walk. But you need LA from matrices to spectral decomposition and Calc from differentiation to Laplace transforms; so no easy feat. You'll need a fair amount of "give a damn" to put yourself through it.