The aim of the research The aim of the research was to examine the existance of differences in the academic success between individual groups according to the profile of secondary school, as well as to examine the link between postsecondary success, state graduation results and academic success. Study plan The research was historical cohort research. Respondents and methods The respondents were undergraduate students who enrolled in academic year 2010/2011, 2011/2012, 2012/2013. The research was conducted at the Faculty of Medicine in Osijek in the period from April 11 to May 3, 2017. Four different variables were used for the purpose of the research: type of secondary school, the average marks at the end of secondary school, state graduation results and the average marks during the studies. Completion of the study was expressed in the year of completion. Results The total number of surveyed students of the University graduate study of nursing was 172. Most of the surveyed students had completed medical secondary school (97) and 9 students gymnasium. Comparing the type of school and state graduation results, medical school respondents have significantly higher state graduation results. The average marks and the duration of studies do not depend on type of secondary school, but there is a correlation between the average marks of secondary school and state graduation results with the average marks during the studies. There is also a significant correlation between the secondary school success and the average marks during the studies for respondents from medical school. Conclusion Secondary school success and state graduation results positively correlate with study success and type of secondary school does not affect the outcome of the study.