Class credit chart where credits can be given to whole class. Table treasures, glass beads or marbles earned for good behaviour/work. Raffle tickets, draw atend of week, marble jar x amount small treat xx amount slightly bigger treat and when they reach top movie afternoon with popcorn. Have a noiseometer..see sparklebox.co.uk. Have clear expectations. Have a traffic light system red amber green all children start in green and can move throughout the day, orange warning, red letter home with reminder of class rules, but only if red by end of day all children have opportunity to stay green. If majority of children in green at end of day, credits, treat jar etc.. Try sparklebox or twinkl (without e) .co.uk and click on behaviour management for lots of resources. Good luck x