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This study employed educational data mining and longitudinal growth modeling to estimate the impact of COVID-19 disruptions on students’ mathematics achievement. Using STAAR data from a large Texas school system, we trained a predictive model on pre-pandemic cohorts to simulate expected Grade 6 and Grade 7 scores for students who missed testing in 2020. A paired-sample t-test revealed that observed Grade 7 math scores in 2021 were significantly lower than predicted scores, with a large effect size. These findings confirm substantial pandemic-related learning loss. The study demonstrates the utility of predictive modeling in contexts of missing data and offers a scalable framework for assessing academic recovery and informing post-pandemic educational interventions.