It would help if you mention what OS you're using...
But this is how you'd do it on a Red Hat based system (RHEL/CentOS/Fedora...)
Export the "/home" dir as an NFS share...edit the "/etc/export" file and share it out to your network...
And start the NFS services
root@host# service nfs restart
root@host# chkconfig nfs on
Edit the /etc/auto.master
and add this
/rhome /etc/auto.rhome --timeout=60
Create the /etc/auto.rhome
file and add this (where 192.168.1.10 is your NFS server)
* -rw,soft,intr 192.168.1.10:/home/school1/&
Start autofs and make sure it starts on boot
root@host# service autofs restart
root@host# chkconfig autofs on
Now make sure all your users have "/rhome/username" set as their homedir in the /etc/passwd file