Recommendations for tough math and science textbooks at the high school and calculus level emphasize the value of older editions, which can often be found for under $10. Dover publications are highlighted for their affordable math and physics books. Users are encouraged to utilize Google for free online resources, including PDFs, videos, and courses. "Fundamentals of Physics" is specifically mentioned as a good resource, with older editions available at low prices. The discussion notes that self-study allows flexibility in tackling advanced material without the pressure of deadlines.