Why can the exam results from a small school vary?.
Imagine a year group with only one student in it. If the child does well, the school gets a 100% pass rate. If a child does not do well, the school gets a 0% pass rate. So, the more children, the less volatile the results are likely to be. The whole thing is on a sliding scale. It’s like opinion polls, surveys and questionnaires, the more people there are involved, the more the results can be trusted as being representative.
