Does anyone have any advice for how to handle 5-6 years olds who are just little shits?

Our school is having major discipline issues and we are having a really hard time figuring out what to do. I have about 5-6 kids in my class who just flat refuse to listen to directions, or listen and ignore them on purpose, take things that do not belong to them, hit, push, and kick. I’ve tried positive reinforcement and the opposite, timeouts, calling parents, taking away things they love, giving them extra attention, literally everything. I am at a complete loss for what else to try. Has anyone experienced this? What did you do? <br><br>Tl;DR I have a lot of kids who are little assholes and no discipline method seems to be working.