Refulse to explain the content of the CEE? You can easily get past papers from ISEB, or from the senior schools in question. It is really no secret!
The point of a school's entrance exam is to select pupils who will do well in that environment. It really doesn't matter when a child is born in the year because they still have to go into a class with all ages.
There are independent schools for all pupils. If a particular school is inappropriate, then there will be another that is much more suitable elsewhere. A given school is never going to be all tings to all people, but a collection of independent schools should cater for everyone.
As for sports/games, IME, all children take part, and it is non-negotiable! No, not everyone is going to get onto the first team but they still take part.
The point of independent schools is for all pupils to reach their potential, and if their potential is A* then so be it. If their potential is D, then they will get there too.
A question about the size of a hockey stick is not really looking for a precise measurement, more an idea of order of magnitude (eg 1 metre, rather than 10cm or 10m).