As a Junior , he averaged 31.2 points per game and 5.4 assists .
Prior to his junior year , Jackson and his family moved to California to attend Justin - Siena High School in Napa , California and play for Prolific Prep .
As a Junior , Jackson averaged 31.2 points per game and 5.4 assists .
Prior to his junior year , Jackson and his family moved to California to attend Justin - Siena High School in Napa , California and play for Prolific Prep .