“…All findings of the studies showed that the lower the secondary school students' mathematics self-efficacy, the lower the marks (performance) of mathematics results they scored. Usually, the studies showed that students' mathematics self-efficacy with some other factors such as mathematics anxiety (Aksu, Ozkaya, Gedik & Konyalıoglu, 2016;O'Keeffe, White, Panizzon, Elliott, & Semmens, 2018;Reyes, 2019a;Reyes, 2019b;Recber, Isikal & Koc, 2018;Yuksel & Geban, 2016), teacher support (Wu, 2016;Yildirim & Yildirim, 2019), online learning (Ichinose & Bonsangue, 2016;Parsons & Gonzalez, 2018), program (Cleary, Velardi & Schnaidman, 2017;Snipes, Huang, Jaquet & Finkelstein, 2016), learning materials (Cai, Liu, Yang & Liang, 2019;Peranginangin, Saragih & Siagian, 2019;Ulandari, Amry & Saragih 2019), instructional games (Reyes, 2019b), and discovery learning (Simamora, Saragih & Siregar, 2019) influenced the secondary school students' performance in mathematics. Hence, the students that have high performance in mathematics were the students' that have high mathematics selfefficacy and vice versa.…”