The effects of teacher practices in promoting student academic achievement, behavioral adjustment, and feelings of competence were investigated in a prospective study of 257 children in 14 first grade classrooms. Using hierarchical linear modeling and regression techniques, observed teaching practices in the fall were explored as predictors of mean levels of student achievement, behavior, and self-perceived competence, as well as the percentage of students who met academic standards as measured in the spring. After controlling for child characteristics at school entry, in classrooms where teachers were observed to offer more instructional and social-emotional support (i.e., attending to students' interest and initiative, providing appropriately challenging learning opportunities, and creating positive social relationships), children on average acquired more math skills, made greater behavioral gains, and had more positive perceptions of their academic abilities. Further, a higher percentage of students in such classrooms met academic standards (two reading, one math). Implications for future research and educational practice are discussed.