My son's academic performance in Y12 so far has been materially impacted by a medical condition. He is improving and he may still do very well by the time of his final tests in June. Predicted grades for use in Uni applications seem to be based on average results obtained throughout the year rather than year end results and this means my son's predicted grades may end up below his real potential. Is there any way I can challenge the school on their approach and give all weight to year end results?