In Numeracy (Reasoning) the gap has increased slightly through the successive academic years up to 2023/24 for Year 3, though has decreased slightly for Year 6 and 9.
Mewn Rhifedd (Rhesymu) mae'r bwlch wedi cynyddu ychydig trwy'r blynyddoedd academaidd olynol hyd at 2023/24 ar gyfer Blwyddyn 3, er ei fod wedi gostwng ychydig ar gyfer Blwyddyn 6 a 9.