Path analysis was used to test predictions of a model explaining the impact of students' perceptions of classroom structures (tasks, autonomy support and mastery and evaluation) on their self-efficacy, perceptions of the instrumentality of class work, and their achievement goals in a particular classroom setting. Additionally, the impact of self-efficacy, instrumentality, and goals on students' cognitive engagement and achievement was tested. There were 220 high school students who completed a series of questionnaires over a three-month period in their English classes. Data strongly supported the model demonstrating that student perceptions of classroom structures are important for their motivation. Also supported was the importance of perceiving the current class work as being instrumental for future success. Implications were discussed.