Mae'r cymwysterau TGAU newydd hyn yn sylweddol wahanol i'r cymhwyster TGAU Mathemateg maent yn eu disodli. Dechreuodd yr ymgeiswyr a safodd yr arholiadau ym mis Tachwedd 2016 ar eu cyrsiau ym mis Medi 2015 a chawsant eu hasesu ar y cynnwys ar gyfer y TGAU llawn o fewn dau fis o ddechrau Blwyddyn 11.
These new GCSEs are significantly different to the GCSE Mathematics qualification they replaced.  Learners who sat the exams in November 2016 started their studies in September 2015 and were assessed on the content for the full GCSEs within two months of the start of Year 11.