My child in Kindergarten recently scored a "173" on the WISC.
As I studied about the percentile, it said that the maximum score possible is "160"... later after leaving the psychologist's office I called him again but the answer was "there is no miscalculation".
I'm still waiting for the official report to be mailed, but if there was no miscalculation, what does this score show?
Any advice/info will be great..

Assuming this was the WISC-IV, and not the new WISC-V, it is possible that the score you were given was an extended IQ score, which could most certainly be as high as 173 (though very, very few children will score that high!). I assume your child is six years old, in which case there is plenty of ceiling in the extended norms for the possibility of a score in this range.

160 is the maximum IQ score using the standard norms. The maximum ExIQ is 210.

What the score means is that your child is exceptional, even among the extremely bright.

Oh, and you belong here...

She is 6 years old now.

Thank you so much for your reply.
I see, so there's this extended score... the report did mention about the extended norm, which I wasn't quite sure what it was about.
Your comment clarified things a lot!
I truly appreciate your help.