Why teach everyone advanced math and physics? Because you have to start training for it at a very young age in order to have mathematically and mentally matured

Why teach everyone advanced math and physics? Because you have to start training for it at a very young age in order to have mathematically and mentally matured enough to be ready for a modern PhD in your early 20's. The system is inefficient but has naturally evolved to give everyone a shot, starting everyone on this path and letting people drop out at different steps along the way. Our society needs scienstis, lawyers, doctors, and MBAs. Everyone's parent want their child to be one of these. So everyone is sent along this path. It's better than the old style where you could only go to school if you were rich enough. That kind of society couldn't compete with a society that found the best among millions instead of thousands and thus naturally eroded away.