If your school blocks MyVMK, myVMKPal WILL NOT remove the block.
The other problem with using myVMKPal at school, is the fact that you have to install myVMKPal. Assuming your school doesn't have application installs disabled for students, unless you always use the same computer, installing myVMKPal would be almost useless as you would have to re-install it every time you wanted to use it. Saved user passwords and settings would not transfer. Another note, saving passwords and account information on public computers (such as a school computer) is an incredibly poor idea, as anyone who knows what they are doing could access you account information.