“Mae’n bwysig cael data lle gallwch gymharu data tebyg, flwyddyn ar ôl blwyddyn, er mwyn gweld pa broblemau o ran perfformiad mae angen mynd i’r afael â nhw. Ond nid yw’r canlyniadau arholiadau terfynol sy’n cael eu cyhoeddi heddiw yn cynnig y math yna o gymhariaeth i ni.
“It’s important to have data which you can compare like-for-like, year-on-year, to see where performance issues need to be addressed. But today’s final exam results do not yet provide us with that kind of comparison.