If the dispute is not resolved informally, or if you prefer not to speak to the inspecting officer, you should make the appeal within 21 days of receiving the notification of the score.
Os na chaiff yr anghydfod ei ddatrys yn anffurfiol, neu os yw'n well gennych beidio â siarad â'r swyddog arolygu, dylech apelio o fewn 21 diwrnod i dderbyn hysbysiad o'r sgôr.