Academic Roadmap: Bridging High School Mechanics to Theoretical Quantum Mechanics

okabe rintarou
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Hello everyone,

I recently graduated high school (CBSE board in India) and am preparing to enter my B.Sc. in Physics. My high school curriculum gave me a solid baseline in basic mechanics, electromagnetism, and introductory modern physics, but I am acutely aware that my mathematical rigor and conceptual depth need a massive upgrade for university-level theoretical physics.

My Current Mathematical Background:

Single-variable calculus (differentiation and integration)
Standard vector algebra
Differential Equations (comfortable with 1st-order and basic 2nd-order ODEs)
Linear Algebra (currently self-studying via MIT 18.06)

My Long-Term Goal:
I intend to pursue theoretical physics, with a specific interest in the foundations of advanced quantum mechanics (including decoherence and the mathematical formalization of interpretations like Many-Worlds). I know this is a long way off, but I want to build my foundations correctly from day one.

My Question:
Rather than just a list of books, I am looking for advice on the conceptual roadmap. How should I transition from computationally-focused high school physics to the rigorous, proof-based theoretical physics required for graduate-level quantum mechanics?

Specifically:

What mathematical milestones must I hit before I can genuinely understand Lagrangian/Hamiltonian mechanics?

How should I sequence my self-study across mechanics, electrodynamics, and math methods to ensure I don't hit a wall when I eventually tackle advanced quantum theory?

Any advice on pacing, conceptual pitfalls to avoid, or the gold-standard sequence of topics (and the texts you'd recommend to tackle them) would be deeply appreciated.

Thank you!
Okabe
 

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