To effectively self-teach math for a physics degree, it's essential to use comprehensive resources and maintain a structured approach. Key subjects to focus on include calculus, linear algebra, and introductory differential equations. Recommended texts include M. Boas' "Mathematical Methods in the Physical Sciences" and Gilbert Strang's "Introduction to Linear Algebra." It's important to supplement these with rigorous math books to develop "mathematical maturity." Acknowledging that some important concepts may be missed during self-study is crucial; thus, engaging with knowledgeable individuals online or in-person can help clarify misunderstandings and fill gaps in knowledge.