I'm a high school student who has completed classical mechanics and electrodynamics with calculus (equiv. AP Physics C). I'm interested in learning quantum mechanics as soon as I can. I've heard of kids my age who are learning that stuff already. Then I open a textbook and see crazy stuff like Legendre polynomials, Dirac delta function, tensors, etc. Should I put quantum mechanics aside for now and just learn math? Should I learn MV Calc, linear algebra, and differential equations before tackling quantum mechanics and beyond? I've come to appreciate so much of modern physics but it has always bugged me how far I am from understanding things like Einstein's field equations and Schrodinger's wave equation. For instance, I tried reading a paper recently and I couldn't even fully understand how the Minkowski metric works.