“…The strength of the predictive power of the combined independent variables on the outcome variable was strong and significant to show the linear relationship between the five predictor variables and the total variance in senior secondary school students' mathematics achievement. These results are consistent with previous findings (Awofala & Odogwu, 2017;Stankov, Lee, Luo, & Hogan, 2012) in which the relation between mathematics anxiety and mathematics achievement is bidirectional (Carey, Hill, Devine, & Szucs, 2016); mathematics self-concept more strongly relates to mathematics achievement than academic selfconcept (McWilliams, Nier, & Singer, 2013) and mathematics self-concept accounted for a significant unique proportion of variance in mathematics achievement (Timmerman, Toll, & Van Luit, 2017); and that intrinsic and extrinsic motivation play a mediating role in the correlation between academic self-concept and academic achievement in 16 to 19-year-old adolescents (Areepattamannil, 2012).…”