High school mostly teaches you to memorize information and to regurgitate it back to your teacher, only to completely erase the information from your mind the moment you walk out after taking the test.
When you go on to college, you do a bit of the same things, but you also learn to think analytically, critically, and to broaden your mind so to speak, but even people who graduate from college will learn lessons from the real world the hard way as well. The sad part is all of this could’ve been prevented with some proper education beforehand.