The studied of the academic performance has been of great interest in research over the years. The main reason for this research is to show the variables that predict adequate or deficient performance as a preventive measure of school underachievement. The sample was made incidentally and consisted of 486 Secondary Education Students between 12 and 18 years old, in the city of Caceres. Along the course 2011/12 education level and occupational class, help received in homework from a family member and self-perception were analyzed as determinants variables on academic performance of Secondary School Students. There were significant differences in academic performance based on the parents' (F = 35.24, P <.00) and mothers' academic formation (F = 38.3, P<.00), the parental occupational class (F = 4.165, p<.00) and maternal occupational class (F = 3.202, p<.00). Similarly, there were significant differences in academic performance based on receive or not receive homework help (t = 2.423, p<.00) and the families perception about their worth as a student (F = 59.800, p <.00). We conclude that a high parents academic education as well as belong to privileged o middle occupational classes are good predictors of high academic performance in children. Similarly, students who didn't receive help at homework and those who perceived of their families a better assessment as students got top scores on academic performance.