I'll tell you what I can-

It's an opiate. It usually doesn't hit you that hard, but if you take more than the "prescribed" amount, you can get pretty fucked up. But it's a pain-killer, so it really just makes you feel like sleeping, or chilling out- i.e. NOT GOOD FOR SCHOOL.

I'll make a suggestion, and you can take it or leave it, dude. Don't take vicodin for fun. If you're going to anyway (cause you'll listen to your friends more than some hippie on a website) don't do it at school. Major buzzkill.