Downgrading on appeal is unfair
Consider a script originally awarded grade C but reduced to D on appeal. The second examiner's subjective judgment does not automatically negate the first examiner's view. Indeed, a third marker may re-award the original result. This is a consequence of the unreliability of scoring - a factor that cannot be entirely eliminated in any assessment system.
So, students who feel their grades are too low should appeal. If an appeal results in a lower grade, they should appeal again, this time using the evidence of the original grade, awarded by the examining authority, in support.
Cambridge Assessment and Development in Education
Stone Croft Valley Road