Hi ,
I have worked on educational android app development. I have implemented a lock down mode in that
.Okk let me tell you what is lock down mode :
In this mode once user opened the app and join the session ...He/she will not able to move out from app , cann't power off the phone,will not receive the calls , I have disabled each and every option where user can interact. And app is up and running ..
I think i can achieve your targets / requirement .
I know how to make system calls in android,
We can easily get control on lock system by making our app as a device admin.
Contact me and explain your requirements clearly ,
Thanks