I would like to suggest for having QRCode for final examination. We can put a QRCode in front of the examination paper (cover page). So, students just need to scan the QRCode to affirm their attendance (this is similar concept with the class attendance).
This would help tremendously to those who teach students more than 100 students. For example, for university course (ULAB and whatsnot), they normally have more than 10 sections. Imagine each section has 20 students. There will be 200 students in the same exam hall and it would be such a hassle for the invigilators to take note of the students attendance based on the paper-based attendance slip which they have to do it manually.
Having QRCode would save time for the students to write the attendance slip and the invigilators too (they do not need to spend time to manually count the paper-based attendance slip.