I sometimes wonder why apple/google haven't made a mode for ios/android that puts them into a school-environment specific calculator mode. Not the usual calcul

I sometimes wonder why apple/google haven't made a mode for ios/android that puts them into a school-environment specific calculator mode. Not the usual calculator app. An actual mode where the device is just a calculator. No distractions. Locked in that mode for a duration or needing a code. Kind of like family locking but not that. Wifi etc is off. Maybe even a setting to ensure the phone is disabled. Another setting to present a blank slate so no notes. No ability to swap to different apps. No notifications. Maybe even have a configuration code that is easy to type in and verify so exam operators can easily confirm. Perfect for the ipod touch. It could easily beat any of the scientific calculators out there, eg battery life. Bonus points if it logs all activity for exam purposes.