Was going to chime in only to voice these exactly. Beat me to the punch. Those are really rewarding classes to throw down in. To the end of universality, in taking these math courses, they will absolutely enrich any physics courses you take since the formulae will show up in fun, sometime (un/)expected correlations.
Building on the why is a key answer. Where ever you find the magic in physics. Honing in on the math itself may well be a fine solution to cutting through to graduation, and applying the skills in those math courses to the physics of your fancy afterward.