You will find this cache near the stile. At no time will you need to enter the school premises as this is PRIVATE PROPERTY.
At GZ you will find a box, locked with a combination padlock. All you have to do is look for the combination.
The numbers on the lock are quite small so reading glasses may be required. A suggestion would be to use your phone's camera and zoom in. .
Qba'g or obevat. Cbfg n gbc abgpu ybt.