Here are relevant courses I have taken as a Physics and Mathematics double major:
Quantum Mechanics 2
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Studied specific topics such as measurement theory, perturbation theory, and scattering theory. Gained refined understanding of molecules and stepping stone for reading condensed matter papers.
Statistical Mechanics
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Studied partition function, photon gases, and fermi-dirac statistics. My favorite course, along with thermal physics why I am in condensed matter.
Fourier Analysis
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Formal handling of Fourier series in periodic and continuous functions. Increased scope of applications where fourier series can be used.
Circuits 1
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Basic circuits analysis with lab, gained understanding of op amps, diodes, buffers, and filters.
Linear Algebra
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The most impactful course I have taken, applications in every area of academia I am in.