The WISC is more accurate and cannot be prepped for. Did you prep your kid for the Iowa or Cogat?

Is anyone able to offer insight on what they scores say about a kid, when looked at together? I was a surprised how low he scored on the WISC-V compared to how he later did on the Cogat and the IOWA.

WISC-V (administered at 7.5yo)
Vocab 16 / 98%ile
Similarities 12 / 75%ile
Block Design 11 / 63%ile
Figure Weights 14 / 91%ile
Matrix Reasoning 11 / 63%ile
Verbal Comp Index 121 / 92%ile
Fluid Reasoning 115 / 84%ile
GAI 118 / 88%ile

IOWA (administered at 9 yo)
Reading 95%ile
Math 99%ile

Cogat (administered at 9 yo)
Verbal 138 / 99%ile
Quant 146 / 99%ile
Nonverbal 130 / 97%ile
Composite 144 / 99%ile