You are much better off to move your forum to
www.school-forum.net/forums then use
www.school-forum.net for the homepage.
All you need to do is create a folder called /forums then move all the forum files in there. Depending on the setup you may need to edit the config file with the new location as well.
Just my .02
There are also a couple of location changes in the settings you will need to change in the admin panel.