The NX Client from NoMachine allows you to connect to the school server from home, and to see/use the same desktop as you use at school.
If you do not want to install and configure the software then try the Web Version
There's also an alternative client, OpenNX, available for systems where the NoMachine NX Client doesn't work.
Most Linux distributions should include the NX Client or NX Player in their own package repositories.
Install it using the normal pkg tools.
Alternatively, you can download the official packages from NoMachine here
Or, the OpenNX packages from here