Hi,
they all sound bad to me. I don't think a native speaker is likely to say any of them. Is it just me? I'd say
"You, him, and them are all good students".Of course, if you had to write that on a test, you'd have to choose one of your options, because on tests, you know... err... they want you to do what they want.

And by the way, some say you hate to say "You and I" because it's more polite to mention the others first. My opinion is that such a rule does not exist, and if someone invented it, it obviously doesn't make any sense whatsoever. Do you think it's polite to blame the others first? Well, you say
"You and I are guilty" anyway. And native speakers say "You and I" even when they want to be rude, and are not likely to say "I and you" in any case. And I bet no native speaker would answer that they say "You" first because they want to be polite, if you asked them... on the other hand, if you asked them about "please" or "May I..." or "Could I", I think they would recognize the politeness.
So you put "You" first simply because "I and you" doesn't sound good, since it's pretty uncommon compared to the other version.

That's my opinion.