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Because a certain percentage of people (i.e. the top 5% or so) need to be kept at an A* percentile, then the next 10% or so of the population at an A. Basically, it is to keep the grading system fair and in balance, they don't want too many people on A*, but equally, they will raise the boundary if lots of people score low. It simply depends on how hard the test is.

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12y ago
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5mo ago

Science AQA grade boundaries can change each year based on a variety of factors such as the difficulty of the exam paper, the performance of students overall, and the standardisation process used by the exam board to ensure fairness. Grade boundaries are adjusted to reflect these factors and ensure that students are fairly rewarded for their level of achievement.

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Q: Why do science aqa grade boundaries change?
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