They say on their adverts that when you work there they will give you good hours and if you are in school they will work around it.

That's lies,

They don't give one crap about your education. When I was in college they scheduled me in on a day I was in college even though I asked for the whole week off. Phoned and told them I can't do it as I It was an important time as we was close to the end of the school year, they Where gonna punish me if I didn't come in as my manager said it wasn't a good enough excuse