Apple Configurator allows you to set restrictions for your iPad devices to keep them more secure within the classroom. These settings are option, but also recommended. Play with the settings on one device to see how they fit within your campus, before you deploy them everywhere. You can select just one iPad from the cart or you can use the regular iPad cable and not connect the cart to the USB port, but just one device.
If you choose to check the box "Installing Apps," prior to updating the devices in the future you will need to uncheck the restrictions profile to remove the restriction and then recheck it after you sync Apps. This stops the students from logging into their own Apple ID and installing Apps.
Restrictions can be a very useful tool to maintain control over the devices. You can simply uncheck the box "Allow Modifying account settings (supervised only)" to disallow students from entering in their own email settings and Apple ID on to the device.
Happy iPading and remember your iOS support team is here for you!