From 2018/19, when written exams were last sat, to 2021/22 the percentage of entries awarded A* to A and A* to C grades at GCSE have increased.
O 2018/19, pan gafodd arholiadau ysgrifenedig eu sefyll diwethaf, hyd at 2022/23 mae canran yr ymgeiswyr a gafodd A* i A ac A* i C ar lefel TGAU wedi cynyddu.