The aim of this study was to examine the correlation between the socioeconomic status and the behavior of the parents with pupils’ school achievement. The participants were pupils of the fifth and sixth grade from two primary schools in Zagrebačka County. There were 79 participants, of whom 13 boys and 66 girls. The average age of pupils was 12 years. Data on socioeconomic characteristics of the family was collected and, pupils assessed behaviour of their parents on Parental Behavior Questionnaire (Keresteš, Brković, Kuterovac Jagodić & Greblo, 2012). Analysis of the results revealed a statistically significant correlation between parental education and pupils’ school success. The higher level of parental education was associated with better grades. The statistically significant correlation between the grades and the assessment of material opportunities in the family was only in the case of an English language, which means that pupils of better material opportunities also have better grades in English. There is a positive correlation between the assessment of the material opportunities of the family and the number of family members, and the pupils who have estimated that the material circumstances in their family are better compared to the others, also have many different technologies at home and have more frequent various experiences involving family outings. When it comes to the correlation between the grades and the parental behavior, statistically significant correlations have been obtained only in the case of mother's permissiveness, with overall success at the end of the last school year, with a grade in Croatian and a grade in English. The correlations obtained are negative, which means that pupils who evaluate their mothers as permissive also have lower grades.