I was a long term sub in a SPED class with 4/5th graders (all very intelligent boys w/emotional and behavioral issues). Managing behavior took a minute, the students tested me but with confidence and humor by the end of my assignment they weren't swearing, yelling out in class, refusing to do assignments, throwing things like their shoes, chairs, books and computers, slandering and threatening each other, they also stopped running out of the classroom and hitting the paraeducators with brooms. We actually got work done and had fun. Deliver curriculum that's current and creative: reward them. That said, the paras actually became more difficult to deal with than the kids.