The difference of pre-class preview time affects online teaching quality

With the outbreak of COVID-19, many courses in Universities have to change from face-to-face teaching to online teaching. This new technology is a unique experience for teachers and students, making teachers have to explore new teaching methods. In the past, in colleges and universities, teachers generally did not provide students with subject materials in advance. This article hopes to make a change, and thus we selected 75 undergraduate students in two classes in a university in Beijing. Taking the subject of civil aviation cargo transportation as an example, we upload learning materials online in one class for the day ahead, and their students can preview the subject's difficulty. However, learning materials of other classes are upload four days in advance. The teacher first teaches basic theories according to the subject guide and then conducts online tests through questionnaires (via an online questionnaire distribution site: Wenjuanxing) to assess student results. The independent sample ‘student test method’ will be used to compare the students' scores in the two classes. Findings show that the students who previewed one day ahead of the class perform better than those who preview four days ahead of the class.