I am taking AP Calculus BC and I want to self study math so that I can be good at it. The field of mathematics I want to study is applied mathematics. What methods are good for studying math by myself and becoming good at it? Which topics should I study sequentially after learning AP Calculus BC? By topics I mean topics that are equivalent to university math courses. Please don't say, "It depends on the university" but say which math courses that YOU took to get your applied math degree (masters 6 year).