I have two daughters now there ... Both started at secondary school.
The first was shy, very shy, very good at school but never manage to be at the TOP because she was extremely shy, and lack of confidence. She is in top set in Maths and Sciences and she is doing extremely well. Not TOP of the class but on the TOP group !
The other, not as shy: we decided to send her there too after passing other exam (eg Surbiton).
The class are small (17 and 14 kids) and it is a joy for us parents paying so much that the class are kept small. This is not because parents are not applying ( I know 2 kids in my old daughter school that did not get the offer last year) but because I think it is not as easy as it sounds to get into it.
You don't need only to be accademically good, but they also look at the personality of the child and the family.
The teachers do care, and if you are good, you will definetely shine ... if you are not so good, they will help you to increase your confidence and will become good by the time you go!
The older girl knows everybody in the school and I believe the teachers and Sister Paula (Head mastress) probably knows all of them ....
Exam wise: the yougest found Surbiton ammission exam easier than St Catherine.
Regarding study: they do get quite a lot of homework and so far I didn't have to get any ''extra tutoring'' as other parents from LEH,Surbiton and Hampton boys are doing with their own kids, because expectation are way too high .....
And I didn't need my kids to give up any after school activities (as I know some parents were asked from LEH).
In general I think a good child will do good regardless what school he/she goes especially in the area.
There are some very good school.
What you get in St Catherine, is smaller classes, more attention, better facilities (because less kids to share) and you also get a better choice of universities, not just because of the results, which are pretty good for such a small school, but also because of the teaching techniques on how to pass an interview ....
My girls go to school with a smile, and come back home with a smile and this is what it is important for me.