“…Based on these two theories, it is not surprising that OTL showed direct effects on student problem-solving performance and mathematics performance, as well as indirect effects mediated by mathematics anxiety in the current study. Although limited empirical research has explored the direct and indirect effects of instructional quality on student mathematics performance through mathematics anxiety, a large amount of research confirmed the positive effects of qualified mathematics content on student mathematics-related cognitive skills and mathematics performance (Cogan et al, 2001;Byrnes and Miller, 2007;Lleras, 2008;Byrnes and Wasik, 2009;Lee and Chen, 2009;Reeves, 2012;Albano and Rodriguez, 2013;Grouws et al, 2013;Tar et al, 2013;Ottmar et al, 2014;Schmidt et al, 2015;Santibanez and Fagioli, 2016), as well as the studies on training or tutoring programs provided some evidence for the effects of mathematics content and skills on student mathematics anxiety (Frenzel et al, 2007;Supekar et al, 2015;Ching et al, 2020;Passolunghi et al, 2020;Tomasetto et al, 2021). When students get better content coverage on the key topics in their daily mathematics lessons, they may feel less anxious about mathematics and they may be capable to use proper cognitive skills or strategies to solve complex problems, and all of these may lead to a better mathematics performance.…”