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May 5, 2026
For about twenty-five years, the dominant message in teacher training has been clear. The research says mixed attainment is better. Setting damages confidence, harms low attainers, and widens the gap. Then in April 2026, the EEF published a study that complicates all of that.Nine thousand pupils, 97 schools, two years of data. The finding: pupils in mixed attainment classes made roughly one month less progress in maths than pupils in sets. High prior attainers made two months less progress. An...