ewee I am sure that if you have a child who scores consistently above the 98th percentile after a bit of practise then you are wasting your money on a tutor for VR/ NVR and they have a good chance. Whether you believe me or not untutored children did get into Tiffin, I obviously can't name names but I can quote the example of the Old Vicarage, Richmond Prep that if nothing else coaches its pupils to within an inch of their lives to get them into selectives and does no more to prepare them for VR and NVR than to do one practise paper per week in VR. I am sure they come under lots of parental pressure to do more and if they knew a way that worked better they would be doing it!! Though most of the parents are going for indies they have had a steady 1 or 2 per year getting places at Tiffin, and they are not, since the pushiest parents are out for the kudos of the top of the league tables, the ones to tutor on top of the cramming. I also question the value of tutoring because I know so many parents of bright kids who didn't get in, in spite of a year of paying a fortune to make a weekly trek to be packed into the kitchen of one of the star tutors with 5 others, having only been accepted after scoring above the 97th percentile in the first place. These are kids who have gone on to success, in one case 4 A*s. My impression is not that it's a race of the tutored but based on who I have seen get in or not, that the whole thing is more of a lottery, more so than can be explained by girls having an off day. TGS obviously are not going to go out of their way to make the process more fair and discriminating because any girl who can score over the 97th percentile is bright and capable of doing well.
It also appears that tutors themselves do not subscribe to your argument that the brightest child will benefit most from coaching, here a tutor saying that the biggest problems are where children aren't already avid readers and good at English (as you would expect of children with good VR since motivation follows abilities) That makes more sense. Tutoring would therefore be more appropriate if for a reason other than just not being that able, they are not (but then would you send them to Tiffin). He is also quoting another education writer saying that you should come to NVR with a fresh mind.
Are there really a lot of children getting near 100%? The top percentile they measure to is the 99.98th, ie the child is one of only 0.02 % of the population that scores that highly. If more than 2 or 3 (10 times the national average) of the 1300 applying to Tiffin are scoring that then any psychologist would be seriously unprofessional if they didn't start questioning their tests, there just won't be that many children capable of achieving that score likely to apply to Tiffin in the whole of West London!
With attainment tests coming the standard of tutoring is bound to plummet anyway. DD works part time as a tutor and gets sent by some agency who charge a fortune for her services to tutor kids in Maths for 11+ in North London, she is obviously an amazing girl
but experience of the tests / teaching children, zilch!!