But the Coloma Convent is not completely comprehensive, unfortunately. It is only for girls. It is only for girls who have Catholic parents, who have been baptised within weeks of birth, who have received First Communion, whose parents attend mass regularly on Sundays and holy days... If the school is undersubscribed in these categories, it is open to other girls. If it is oversubscribed, distance and other services to the Catholic Church act as tie breakers. If I lived in Croydon, since I am an atheist mother of boys, my children could not go there.
In the 2011 cohort (the one achieving the 90%) there were only 3 low attainers (2%) compared to 101 high attainers (68% getting Level 5s at KS2). There were only 4 disadvantaged pupils. (Compare to my local comprehensive with 24% low attainers, 21% high attainers and 29% disadvantaged pupils).
Anyone who follows a religion, who attends religious services regularly and who gets their children baptised is displaying character traits that suggest they will be supportive parents. Of course being supportive doesn't mean that your children will be high attainers, but there seems to be a suspiciously strong link from the data. People with chaotic, difficult,'disadvantaged' lives are in no place to manage the stringent religious observance criteria, even if they wanted to - they're too busy struggling to give their children breakfast and clothe them, never mind getting them to Sunday School (even assuming they're not Moslem or Hindu or not practising at all).
I may spend all evening looking at the DfE's fascinating tables.