The primary factor influencing student achievement is the students themselves, with significant variations in learning outcomes attributed to their innate characteristics, such as IQ and perseverance. Research indicates that approximately 80% of the variance in exam grades can be predicted by an IQ test taken years earlier. Students with higher IQs tend to engage more with their studies, creating a positive feedback loop that enhances their learning. Conversely, students who struggle may become disengaged and discouraged, undermining their academic success. An analysis of data suggests that only about 10% of the variance in test scores is influenced by the school itself, emphasizing the limited control schools have over student performance, while the remaining 90% falls outside their influence. Consequently, improving teacher quality becomes essential, as effective teachers demonstrate consistent success across diverse socioeconomic contexts, implying they possess inherent qualities that contribute to their effectiveness in fostering student learning.

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