Do you know that doing all that stuff on the last day of school doesn't mean that it won't be heard about by other people?
What if you get caught by the police? Charged with assault/criminal damage?
Plus if your headteacher finds out it'll go on your record and wherever you decide to go next will know about it, almost killing your chances of college/university/future employment.
I'm not saying not to do it, just be careful eh.

