Well, as a logical suggestion, why not install the rat into a flash drive along with a few other miscellaneous programs, go home, and wipe your drives a few times if you've got anything illegal on them; and go to school, and tell the principle that you didn't knwo you had it, and since now you do you have wiped your computer. Inform him/her that you're very sorry, and ask them if there's anything you can do to help them out. You'd be surprised what the outcome may be. I hacked my school network WAY back in the day, and the IT specialist figured out it was me (everyone else there was FAR too stupid - Dumb redneck town) and he actually let me help him set up the protection, and gave me the information to do pretty much anything I wanted on the network.
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