The main agenda of such children is to seek attention, they don't want to study and don't let others study. A solution according to me is to ignore him don't react to whatever he says. It's like when dogs bark let them bark. After a while, he himself will realize that what he is doing is a waste of time and money for his Parents. If the situation worsens then take strict action against that child and Make a letter to the concerned teacher so that she makes him sit somewhere else, but I think if u make him understand your point in a sweet manner he will surely understand it. Hope it helps you !! Please mark it as the best.