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The National Foundation for Educational Research (NFER) evaluated it for the Education Endowment Foundation (EEF) in a randomized trial in 63 English primary schools. Schools were randomly assigned to use it in Years 2 and 4 or in Years 3 and 5, and the other year groups served as controls. Pupils used it from September 2024 to June 2025. NFER found that pupils allocated to Maths-Whizz made one additional month's progress in math, an effect size of 0.08. Pupils eligible for free school meals made two additional months' progress. The main finding has a high security rating on the EEF's scale. Pupils used the platform for about 32 minutes a week. Whizz Education recruited the schools and delivered the program, and in close to half of the schools Maths-Whizz time replaced some math teaching. The report calls the tutor AI-enabled but does not say whether it learns from data. 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