I wouldn't do such a destructive thing.
Attack your School webpage instead, search for XSS,SQL Injection and that sort of things.
There are lots of very good hackers (most of them are ethical) at http://sla.ckers.org.
CReate an account in the forum and PM some users asking...
See the folloeing sites, they are good.
I visit the following hacking sites almost daily. They are very good and focus into Security of WebSites and Wireless.
Separate names with a comma.