Grading is the final act of the teaching process and an part of evaluating the entire educational process. Among other factors, the overall success of students is measured by final grades. At the end of the school year, the overall success is determined for the student who has been graded in all subjects with a numerical grade. The student's performance can be graded as: 1 "insufficient", 2 "sufficient", 3 "good", 4 "very good", or 5 "excellent". The aim of the research was to make a systematic analysis of data related to the overall success of lower primary school students in the Republic of Croatia from the school year 2013/2014 to the school year 2022/2023. Available data from Školski e-Rudnik (Vol. 2), a publicly available online database published by the Ministry of Science and Education, were analyzed. The research results indicate that lower primary school students in Republic of Croatia had an upward trajectory in their overall success from the school year 2013/2014 to the school year 2019/2020. From the school year 2019/2020 the overall success of students has been declining, which is noticeable even today. Despite the decline in average overall success of lower primary school students, the average remains at the "excellent" grade. Analyzing the average overall success of lower primary school students in Primorje-Gorski Kotar County, the results were the same as those of lower primary students in Republic of Croatia. Comparing the overall success of female and male elementary school students in Croatia from 2013/2014 to 2022/2023, it is concluded that female students had a significantly higher overall average than male students throughout all school years and grades. However, male students achieved a better increase in the average than female students. According to the research results, it can be concluded that there is a trend of "grade inflation" in primary school classes.