Pre-experience business school (BSc) doesn't launch you straight into leadership positions.

Post-experience business school (MBA) can do that (that's usually leadership of 1-2 kids straight out of school), however to get an MBA you need work experience ... which means yeah, you have done the entry work somewhere

Note: I am not saying that they have done "basic" work (as in: developing code, flipping burgers etc.). But they definitely are not launched into leadership position without ever having done anything.