We acknowledge the existing educational inequalities that South Africa faces as a result of differences in developmental and equal educational opportunities. The aim with this study was to investigate the role of non-cognitive learning performance variables that affect the learning performance and success of secondary-school learners. Data were collected from a sample of 395 Grade 9 learners. The proposed learning performance structural model was empirically evaluated by using various instruments and was analysed by means of structural equation modelling. The results indicate statistically significant positive relationships between learning performance and cognitive engagement, learning performance and grit, cognitive engagement and conscientiousness, grit and learning motivation, grit and cognitive engagement, learning motivation and parental quality, learning motivation and tenacity, learning motivation and cognitive engagement, and conscientiousness and resilience. Both tenacity and parental quality acted as moderators of the relationship between environmental unfavourableness and cognitive engagement. The selection of variables was more effective in explaining variance in cognitive engagement than in learning performance. The results of the study could be used to facilitate cognitive engagement as a pivotal variable in learning success among secondary-school learners.