I'm currently a rising sophomore (undergrad), and I'm trying to fill in some gaps in my applied math background this summer. So far, I've taken linear algebra and multi/intro analysis, but they were both theory-only and had very few applications (ex: I finished LA without knowing the various methods of diagonalizing or inverting a given matrix). I just finished going through Boas' text, but I feel like I need something a little more condensed (only bits and pieces of about 1/3 of the chapters I hadn't seen before). Any recommendations? (For next year I'm looking at QM, stat mech, and possibly GR) Also, is self-studying texts the best way to be going about this? I would really prefer saving an elective spot for pure math rather than a mathematical methods in physics course.