This study assessed the role of prior personal best goals in predicting subsequent academic motivation and engagement. A total of 1160 high school students participated in a longitudinal survey study exploring the extent to which personal best and mastery and performance (dichotomous) achievement goals predict students' academic motivation and engagement across the course of a full academic year. Findings showed that personal best goals predicted higher motivation and engagement a year later. Along with personal best goals, mastery goals also predicted higher motivation and engagement, while the role of performance goals was either neutral or negative. These findings provide support for the contention that personal best goals are associated with higher motivation and engagement across time.