This study examined the effect of two family factors (financial, social capital) and school factors on students' achievement. One hundred eighty two, seventh-grade female students from nine schools in Muranga district, Kenya, were studied. The statistical procedures included logit regression, cross-tabulations, frequency counting and chi-square analyses. These procedures were used to look at the effects of variables on each other and their effects on students' study habits and achievement. The researcher found that each of the two family factors (financial and social capital), and the school factors had an independent and significant effect on student achievement and study habits. The results indicated that a student's academic achievement is positively influenced by the education level of both parents. The researcher also found that the father's education had more positive influence to the study habits of the females.