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AS level results for England, Wales and Northern Ireland have been relatively stable in recent years, with only very small changes in the overall percentages of students achieving grade A. But we know that individual schools and colleges may see variation in the proportion of students achieving particular grades from one year to the next. This can be due to many different factors, including differences in the mix of the students entered for particular subjects, different teaching approaches, changes in teaching staff or teaching time, and changes to qualifications.