In its paper entitled Exams - Do We Need Them?, it said that in a system based only on teacher judgement there may be unintentional bias by teachers for or against certain social groups, such as a "halo effect" around affluent pupils who had previously performed well.
"However, the experience of exam cancellations over the last couple of years tells us all we need to know about the important role that exams play in ensuring quality, consistent marking, and equity across the social divide."
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