In deciding which establishment is ‘main’ or ‘subsidiary’ you should consider at which location the pupil is likely to spend the majority of their time during the academic year.
Wrth benderfynu pa sefydliad yw'r 'brif' ysgol a pha un yw'r 'is ysgol', dylech ystyried ym mha ysgol y bydd y disgybl yn debygol o dreulio'r rhan fwyaf o'i amser yn ystod y flwyddyn academaidd.