Use a form like this to track student points during the day. Reward each student as soon as they reach their goal. They will be modeling desired behavior for the rest of the class.

Collaborate with students to determine a motivating class reward. Then post a visual so the class can track their progress. Be creative! You could make a thermometer that rises or put together jumbo puzzle pieces.
Disclaimer: The above links are purely for educational purposes and are not intended as psychological interventions or as a substitute for psychological treatment. If you are in need of psychological help you should seek the consultation of a licensed mental health professional. Please note that the links may contain advertisements and linked videos and websites that are not endorsed by the school district.