For us the K-Bit wasn't a reliable test. It did give indication for my older DS that more testing was needed (K-bit score was 145 and the WISC-IV GAI came to 148). For my younger DS the K-Bit came back at 116, but later on at a different school they gave him the Cogat which came back with 144. Pretty big difference!
I've been told by others that it can test high, but that wasn't the case for us.
Good luck!