Let sjust put this plain and simple before it gets out of hand....
It's a sophomore. Disciplining is over. You cannot take stuff away as punishment. Does not work any more. They are not 5.
You are an adult with knowledge, he/she is about to become one. Only thing you can do is teach them. There are many ways you can teach them. By example, by talking to them, by showing them the consequences of their decisions. If they decide to listen, good. If not, you have to let them fail so they can learn. There is to much emphasis on making there kids not fail. Guess what, if they do not learn to fail, they will not learn about the consequences of failing and they will never learn to deal with failure, which will happen whether they like it or not.