1.you should understand and then explain other students to make this a rule.
2. Assign it as a duty to students one by one for a fixed period of time.
3.every one swear that you will always check the switches of class and then go outsides
4.you can do to make students realize this things.
you should understand the value of resources of our country.
and also we are studying from childhood that we should save energy. we will save energy for a better future of our country