"Before accepting private school offers it is generally good time to get some specific feed back from different schools. One school could be argued just an outliner cases, but a few should give you a good picture where your DD stands against the entire 11+ SW London cohort. It is just anuseful information and additional data point for your decision making."
The thing is with this - they do not take GCSEs in VR, NVR or 'CAT skills' or Atom or whatever!
Chances are, they will never see those kind of tests again, so they are totally irrelevant.
In any secondary school they will obviously be exposed to a range of subjects across a curriculum. An adaptive computer test or Atom has no bearing on who will enjoy or excel in Geography or RE or History or Latin. Most subjects in fact. In any school, there will be some who are strong in particular subjects - this is regardless of their 'ranking' on entering the school. Those tests are blunt instruments. CAT scores also change.