My DD8 has a not dissimilar pattern:-
VCI: 150
PRI: 145
WMI: 104
PSI: 123
In her case the WMI (and to a lesser extent her PSI) just slaughtered her FSIQ (143) whereas her GAI is 158, literally a whole SD away.
To my DD8's credit, she did the full test without any breaks and was flagging towards the end by the time that the WMI/PSI tests came along - I had not provided any snacks/drink and the test spanned her usual lunchtime - note to others, provide these.
What the tester told us was that WMI/PSI often end up depressing scores for 'gifted' kids and that the GAI is a better indication of her cognitive abilities. This still feels like cheating a bit but even DYS apparently considers the GAI in lieu of FSIQ.
Having said all that, we did apply and I think that my DD's application to DYS was rejected as I have read that all of the rejection letters are sent out at the end of the month and we haven't heard anything yet so take all that I have written above with a grain of salt
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