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First you would say good morning teacher and then what you do out of 11 students take 3 and use them as researchers(students) and take the rest as farmers(students) the then what you do is show a farm in which those 8 workers(students) are doing something for rainwater harvesting and 3 people come and ask them about rainwater harvesting then one by one you people so speak information regarding the thing any information take out from the net and speak it. After a while the researchers will also say something about rainwater harvesting. You will have to add a lot of dialogues and logical talks. Then end saying thank you. 
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