Anti-depressants aren't an excuse for being an asshole. In fact, they should make him less of an asshole if they're really doing their job.
Don't worry about him--you're all adults, and therefore you should all (in theory) be able to take care of yourselves. He'll find a new study group and new people to annoy. You have to focus on you and getting through exams. Talk to your study group without him, see what they have to say, and go from there--based on what you've said, I guarantee they're annoyed too.
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If I am not better, at least I am different. --Jean-Jacques Rousseau
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