To prepare for a career in aeronautical engineering, focus on a strong foundation in math and physics, as they are essential for all engineering fields. Recommended subjects include chemistry and accounts or business studies, alongside compulsory math. Improving math skills is crucial, and various online resources can help visualize mathematical concepts. Engaging in hobbies like aircraft model building and exploring aviation-related magazines, such as Kitplane, can further enhance interest in aeronautics. Overall, excelling in core subjects and participating in related activities will help pave the way for a successful engineering career.