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Yes, from age 6-7 children can scan QR codes with the camera of a phone or classroom tablet. The key is to ensure devices have the camera enabled and QR codes are large enough (minimum 4×4 cm on paper).

QR codes themselves do not add security to exams, but you can use them to distribute the exam paper at the start time (avoiding prior leaks) or to access online forms with time limits using platforms like Google Forms with restricted responses.

Yes. Print the QR next to the exercise or in the page margin with the link to the complementary digital resource. If the books belong to the publisher, you can generate QR codes on separate worksheets or classroom posters to avoid modifying the books.

QR codes are complementary, not substitutive. Physical materials remain accessible without scanning. For students without a device, a classroom tablet or computer can be made available, or the teacher can project the resource directly on screen.

Static QR codes have no access protection — anyone who scans the QR accesses the resource. If you need private content, use virtual classroom platforms with authentication (Google Classroom, Moodle) and link to content that requires login. That way the QR is just the entry point, but access is controlled.