"Once given to 11 year olds"?

I'm starting to prepare my son to take it this time next year. Some observations so far:

- It exercises some core problems solving skills.

- It is a good arena for learning how exams work, particularly the time keeping, without getting mixed up with learning a large body of knowledge.

- Having a performance metric would appear to affect the whole education system (for the better).

- By removing those pupils who (at this point in time) do well on the 11+ into seperate schools, it allows the secondary schools and their teachers to concentrate on the next stratum of kids who are no longer in the shade.