To set up your tablet as a kiosk mode and limit the use only on specified App, now there are easy way to do it!
You still can see some of the iPad security enclosures blocking the HOME button to avoid users from switching to other App which is no longer necessary! To enable the kiosk mode under iOS just need to implement the "Guided Access", this feature even can disable the "HOME" button. For the detail instructions you can follow
reference of Apple support site - http://support.apple.com/kb/ht5509
There is no "Guided Access" mode like iOS under Android, therefore, we recommend the 3rd party solution - SureLock. To enable the kiosk mode for Android devices, the current best choice is to use "SureLock Kiosk Lockdown" under "Single Application Mode" which can be found at Google Play. For the detail instructions you can find at -
reference of Google Play - https://play.google.com/store/apps/details?id=com.gears42.surelock&hl=en