“…In a metaanalysis, Credé et al (2017) showed that the relationship between grit and school performance was weak when it was modulated by other variables that grit is strongly related to, such as conscientiousness (Fite et al, 2017;Ivcevic & Brackett, 2014;Schmidt et al, 2018), selfefficacy (Usher et al, 2019), and self-control (Muenks et al, 2017). Nonetheless, many studies have found higher levels of grit to be related to better academic performance in university students (Akos & Kretchman, 2017;Bowman et al, 2015;Eskreis-Winkler et al, 2014;Fong & King, 2019;Hwang et al, 2018;Muenks, et al, 2017;Muenks et al, 2018), high school students (Duckworth & Quinn, 2009;Muenks et al, 2017Muenks et al, , 2018Steinmayr et al, 2018), and middle school students (Clark & Malecki, 2019;Dumfart & Neubauer, 2016;Hagger & Hamilton, 2018;Malanchini et al, 2018;Steinmayr et al, 2018;Tucker-Drob et al, 2016), and that grit plays a mediating role in the performance of students with low cognitive ability (Light & Nencka, 2019). Nonetheless, most of the work has been carried out with students in the USA, and few studies have been carried out in Europe (Dumfart & Neubauer, 2016;Steinmayr et al, 2018).…”