iPads are required in some public school classrooms, in place of textbooks! There no "lockdown mode" that the teacher can enable, to lock to the apps/websites related to the lesson. It's INSANE.
Then it can't work. Textbook, website for the problems, notes app, etc. Multitasking is required when the answers are input online (which is a problem itself).
https://apps.apple.com/us/app/classroom/id1085319084