People are at liberty for asking for 11-plus tests ranking or quintiles if they really need to but this really is meaningless. It's one test on one day when they were 10/11. They have 7 years in whatever school they go to and literally anything can happen. I've seen it all over the years - those who come in with academic scholarships have quite often 'burnt out' by year 9. Or even if they haven't, they are middling. They all develop in different ways at different times. There is no such thing as 'top' anyway because they are all doing 12 or so subjects - so 'top' at what? There will be mathematicians who are not great at essay subjects. There will be artists, linguists, etc etc. It does not happen that they are 'ranked' across all subjects. Aldi these CAT scores will change - a lot! Some pupils are very average all the way through but then come into their own at A-level when they can focus in the subjects they are best at. I have seen children come in with academic scholarships and the pressure is so much that they can't cope with not getting the highest marks in tests ( which WILL happen). Some get so anxious they end up having to leave. I know two who suffered so much with MH they had to leave the school; while others who got in on the WL went on to get a full sweep of 9s.
It doesn't matter where they sit in the cohort. If they get in, they get in. For the 100 or so who end up in Year 7 at G&L or SPGS or whichever school, there will be hundreds more who did not get in but could have coped just as well, if not better, than the ones who did. The girls in SPGS or G&L are not a rarified breed. There will be girls in comprehensives up and down the U.K. who are just ad academic as any of them. When they get to uni, they will find this out very quickly. With the 11 plus, a lot if it is luck on the day. These tests are very arbitrary. But I suppose schools have to do something with di many applicants per place.
When they get into the school, the most important predictors of how well they do will be their mental health, support from home, happiness, confidence and friends. The quartile they entered the school in, based on one test, is utterly meaningless. With In a few weeks, other tests will have different results anyway.