if GCSE results day were to occur in the third week of August in the same week as AS/A-Level results [Footnote 20].
Os felly, gellir gosod boeleri llai effeithlon sydd â gradd C neu D gan SEDBUK, cyhyd â'u bod yn cyfateb o leiaf i'r cyfraddau effeithlonrwydd a nodir uchod.