[meetatkumaran]

i am looking to prevent students to using internet and other restricted application. i have tried some free apps but none gave me perfect solution

[hallux]

Welcome as a new member! Are the devices owned by the organization or the student/family? What devices are we talking about?

You would need some kind of management solution to push policies - Google may have one that does what you need, as part of your education solution but the devices need to be connected as managed by the organization.