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First of all warn him/her from doing any further litter.
Then I would explain him/her the importance of cleanliness in class.
Still if he/she is doing I will have to complain to teacher(as in schools they are the head) and write a letter to the Principal on requesting to interfere into the matter.
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Firstly, I would brief him the importance of keeping the class room clean.Further, i will show him a class room which is neat and clean and tell him that being clean reflects his  personality.I will not make a complain to anyone as I should motivate him.Sometimes  I myself will pick up the litter(by him) and throw it in the dustbin..This will bring some changes.I will request the management of the school to give some prizes monthly for the (best) clean class room
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