The mathematical machinery of physics: Lagrangian and Hamiltonian mechanics, least action, Maxwell's equations, special relativity, the linear algebra of quantum mechanics, Noether's theorem, tensors, and normal modes.
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Every idea is taught with motivation and a worked example before the drills, and an FSRS spaced-repetition engine schedules each review for the moment just before you'd forget it. A short placement check finds what you already know, so you start Mathematical Physics exactly where it's useful.