Based on three data sets of information on students of a university in Vietnam, we estimate the factors affecting GPA by using the two-stage least squares (2SLS) method. The results of estimation highlight that parents’ occupation as farmers and living location in rural areas have an adverse impact on the GPA of students at university (University GPA). Causally, the government does not control or monitor the hours of part-time work of students earning a living cost and tuition fee, which rise dynamically in city located the university. Furthermore, we also find a positive relation between national university entrance point and the university GPA
