One of the most salient problems in education is the achievement gap. The researchers investigated the effects of parental education and parental occupations in science, technology, engineering, mathematics, or medical professions (STEMM) on the achievement gap in mathematics. Because students were nested within schools, two-level Hierarchical Linear Modeling (HLM) was the main analysis. Findings were consistent with another Multilevel Modeling analysis, that is, parental characteristics such as parental education had a positive effect on student achievement (Teodorovic, 2012). Moreover, parental occupations in STEMM had a positive effect on student mathematics achievement.