Average attainment is presented as months higher or lower than the attainment of the same year group in 2022/23 (2022/23 performance is denoted by the zero line on the graph).
Dangosir cyrhaeddiad cyfartalog fel nifer y misoedd sy'n uwch neu'n is na chyrhaeddiad yr un grŵp blwyddyn yn 2022/23 (dynodir perfformiad 2022/23 gan y llinell sero ar y graff).