To study physics and mathematics from the foundations up to an undergraduate level, I recommend using textbooks like "University Physics" or "Physics for Scientists and Engineers" for physics, and "Calculus" or "Mathematical Methods in the Physical Sciences" for mathematics. Online courses from platforms like Coursera, edX, and Khan Academy can also be helpful. Take advantage of open educational resources like MIT OpenCourseWare and engage in online forums and communities for additional support. Practice problem-solving regularly to reinforce your understanding.