Use the camera to scan the student's multiple choice answer sheet. After the student finishes filling in the answer sheet, submit it to the teacher. The teacher just needs to take the phone with the QM app installed, scan the sheet to immediately display the score results, correct answers, incorrect answers, and illegal answers. With dozens of different test codes, with the QM app, marking is not difficult, extremely fast and accurate in just 3 seconds. It can be even faster depending on the marking speed setting and the teacher's hand movements.