He ain't heavy?

I am frustrated and angry. I have never heard such ridiculous reasoning in my life. I cannot understand how someone can continually place cca above studies, can continually do badly in his exams, and yet keep slacking off. Each time the results come home he promises to work hard in the future, but of course, the vicious cycle continues, no visible change can be seen. What should I do? Should I even be worried? I'm mad, pissed off by his attitude, which always blames everyone around him for giving him a sucky attitude, without ever questioning WHY anyone would give him that kind of attitude in the first place! There is no action without a cause, and franky, everyone is getting fed up with his seeming nonchalent attitude towards academia. His whole life seems to revolve around his cca.

He asked why I was so angry with him. I told him the reason. He said I had no right to be angry, since it doesn't concern me and he thinks it extremely odd that I should bother myself with his grades. Odd?? Unnatural?? It is the most natural thing in the world! What's unnatural is the fact that he thinks I shouldn't care, and that other people are justified in doing so, but not me. Because it doesn't concern me. It doesn't concern them too! Of course, the greatest irony is that he doesn't seem to give a damn either.

I'm so frustrated that he's so short sighted and self-centred and lazy. I can't help but be angry and irritated. I'm at my wits end. And I really need to let off steam.