Welcome to the forum Roxie!

I'm not familiar with the Sages Reasoning test, so can't help you there. Re the WISC, my ds12 has dysgraphia and has taken the WISC twice. Dysgraphia will most likely impact scores on the Processing Speed subtests, and as Grinity mentioned, you'll want to have the school calculate and use the GAI (Global Ability Index) rather than Full Scale IQ (FSIQ).

Best wishes,

polarbear