It's 11am somewhere in the world, can you guess right now if the schools there are open or not?
Why would you care?
And how does DST help anyway? My kids schools all started at different times. I'm pretty sure they re-used the same busses. The bus would pick up the first group of kids and take them to high school, then come back and pick up the junior high kids, then come back and pick up the middle school kids, then come back and pick up the elementary school school kids. DST was of no use whatsoever in knowing what time any given bus was going to pick up my kid or what time any given school started or ended classes.
And now that my kid has graduated, I don't have any reason to care about what time any school in my district is open, let alone anywhere else in the world. I can't figure out why you care about what time some random school in some random part of the world is open. The vast majority of people in the world at any given time do not have school age children.