To master differential equations and linear algebra for significant improvement in electromagnetism (E&M) and quantum mechanics (QM), several book recommendations are highlighted. A particular book is praised for its clear writing style and foundational approach, although it may not cover all necessary mathematical concepts for advanced E&M and QM studies. Another suggestion is Jefferson's free book, which offers a solid introduction to linear algebra and includes numerous application problems and a solutions manual, making it a valuable resource. It is emphasized that while familiarity with linear algebra is essential for understanding E&M and QM, it alone is not sufficient for a comprehensive grasp of the subjects. Consistent practice is also underscored as a key component of mastering these topics.