Read The Road to Reality: a complete guide to the laws of the universe by Roger PensorePenrose. It provides a roadmap to the entire bodyhandy companion for undergraduate / first-year graduate students of physics. | The first sixteen chapters provide - (in outline form) - all the mathematical material needed for an undergraduate major in (specifically theoretical-) physics - written by a foremost theoretical physicist, (i.e. it provides the "depth" that you wouldn't otherwise find in textbooks or other standardized reading materials).
