Need help finding movie

Need help finding movie

The movie is about high school students going to a beat up high school in I think like Detroit one of them ends up shooting a security guard at the school in a fight and they end up barricading themselves in the school and demand new books and heat for the school one of the kids lives in the attic of the school because his dad’s abusive and there is candles and a painting in the attic, also one of the kids dads was shot at a baseball game in the parking lot reaching for his inhaler and he was African American I can’t figure out the name of this movie plz help