DS's class in his community primary in a notorious area of Lambeth, has a high ratio of EAL children, a very high ratio of children on free school meals, 3 (possibly 4) refugees, and a couple of children with SEN.
The overall results are significantly higher than the national average.
EAL children seem to pick up English very quickly indeed. certainly quickly enough to keep pace with the 'learning through play' process of Reception, and the learning to read process seems very accessible to them and they pick up the language at the same time. (I did 'reading practice' in the class in R).
Also, there is academic research which demonstrates that bilingual children, or those exposed to more than one language from an early age actually develop a better understanding of what language is and how it functions.
All the refugee families with children in his class are incredibly conscientious in supporting thier children's education - of all the people in the school, they perhaps know how valuable it is and how important it is that now here, thier children flourish, fit in and make something of thier lives here.
And as for average attainment - I know there are a few kids in the class who will score v low in SATS and afffect the overall average, butIi don't see how that has any bearing at all on the education or achievements of my heading- for-high-scores DS or some of his friends who are extremely high achievers.
It's a well run school - that's what counts.