Chromebooks have a built-in kiosk mode available for exams, however, this functionality is only available through the Google Admin console and is usable when the Chromebooks are managed by the institution.
As a result, Schoolyear currently only works on managed Chromebooks (ChromeOS). Read more here on how to set this up as an admin.
Unfortunately, it's not possible to use the Schoolyear security on a student-purchased Chromebook. Students who have purchased their own Chromebook (Bring Your Own Device) cannot use this laptop to take exams securely.