Topics on Modern Physics

I've skimmed Walecka's Topics and it seems like an excellent resource on intermediate modern physics for somebody who is separately studying undergraduate mathematics, particularly the undergraduate content of real analysis, linear algebra, differential equations and group theory, but tough for somebody who is taking much less mathematics than physics. If you can commit to the two fields of study in parallel Walecka should be perfectly suitable but if not then there may be eventual problems with keeping up.