To effectively tackle quantum mechanics, a solid foundation in higher-level mathematics and physics is essential. Key areas of study include classical mechanics, electromagnetism, and waves/oscillations, alongside advanced mathematics such as single and multivariable calculus, differential equations, complex numbers, and linear algebra. It's crucial to select high-quality textbooks for these subjects, as many available resources may not be suitable. Additionally, MIT's OpenCourseWare is recommended as a valuable resource for accessing relevant course materials and lectures.