So that you know
This is a computer in a school, to which students have public access. This is probably the reason there have been problems with vandalism from this IP address.  I imagine that other computers in the school have similar IPs, and a similar history of vandalism, though I do not know the network architecture, so I'm just guessing.
I am not sure what your policy is for dealing with situations like this, but I thought it might be useful to let this fact be known.

-A concerned Wikipedian and student