This study examines the effect of personal, sociodemographic, and academic characteristics on the performance of undergraduate students at Kisangani University. Its objectives are to identify the effect of personal, sociodemographic and academic characteristics on the performance of first-year students on the one hand and to identify the determinants of first-degree success. For its realization, we worked with a sample of 200 randomly selected subjects in a population of 1188 subjects. The data collection was carried out using a questionnaire sent to the respondents and the documentary technique which led us to exploit the results of the students. In the end, it should be concluded that the performance of the subjects involved in this research is low. This was not positively impacted by the personal, school and sociodemographic characteristics described in this study. The effect of all these features is negative. As a result, these characteristics are far from being considered as determinant of the success of first-year students. Success is determined by several other factors, beyond the characteristics described at this level.