Nowadays, parental' education background plays a vital role in school students' academic performance. Mother's attention towards students' curriculum completion is obvious but, her educational background does more favor in getting the highest marks. To explore the impact of mother academic background on the students' academic performance is a challenging task. A statistical inferential study was done to identify the significant effect of mothers' education (medu - none, primary, 5th -9th, secondary, higher) on Portuguese secondary school students' academic performance (G3-final grade). The dataset was collected from two public schools of Portugal. The target dataset consists of 649 instances with 33 features was used for the study. Among 33 features, 28 are nominal type and 5 are scale type. The authors considered the final grade as the dependent variable and medu as the independent variable, The samples were found to lack normality w.r.t medu (p < 0.05) but confirmed homogeneity in variance (p > 0.05), therefore The datasets experiment with two non-parametric statistical methods were used. Among them, Kruskal-Walis one-way ANOVA test was used to find the significant difference between mother education literacy groups and pairwise comparison as posthoc test done with Mann-Whitney test using the SPSS 19 tool. There were significant differences found in final grade towards medu groups with (4) =57.21, p < 0.05. Higher education study groups have a high impact (Md=906.50) on the final grade compared to other groups using posthoc test. The findings of the study shall be fruitful for Educational stakeholders (students, teachers, parents and school management).

School; Mean Rank; Mother Education; Student Grade; Father Education