If Hari doesn’t do the work for his mates, but instead shows them how to work out their problems, he won’t be in trouble. He could tell them about the Peer Learning Advisors (PLAs) in the library.
If Hari gives his mates the answers and lets them copy his work, he is in trouble. Hari’s mates won’t be in trouble if they learn from Hari how to do the work. Hari’s mates will be in trouble if they copy Hari’s work and pretend it is their own.