Hi, if you can't forget a network, the wifi network is probably installed through a profile. Profiles can be installed when the devices are rolled out or through a Mobile Device Management Server - if you remove these, the settings may just be reapplied. You may want to ask your IT about this, but if you want to investigate yourself:
Go to settings on the iPad, select general on the left hand column and select profiles on the right hand panel. Are any profiles installed?
However, profiles can contain settings you need in addition to just WiFi. If you click on each profile, under at the "contains" area, it will tell you what's in the profile. Is there one that's just WiFi? Also, you can click the "More details" area on each profile to show exactly what settings are being applied, look for this "test" network in the profile(s) installed on your iPad.
~ Alex