I think that a very usefull app will be that: when you come into to the school some apps switch off automatically, these apps are: whatsapp, facebook, twitter, and all the social networks, except if that app can be used in the school.
Then automatically too some apps will switch on like e books, dictionarys, office mobile, translators, the calendar, and all the apps that can be used in the school.
if a teacher want to show a video to the students in the mobile phones youtube switch on with tat video and the teacher can use the computer to do other things.
Duryng the exams the teachers can switch off all the programs that can help in the exam, and after the exam switch on all the apps.
And finally when the students leave the school all of the apps switch on.