In the most effective cases, leaders in schools have a strong focus on improving teaching and their curriculum offer to support pupils to engage effectively when they were in school.
Yn yr ysgolion mwyaf effeithiol, mae arweinwyr yn datblygu diwylliant cryf o gydweithio lle gall pob aelod o staff fanteisio ac elwa ar fethodoleg drochi gyfunol yr ysgol o gaffael iaith.