My DD took KeyMath3 at the end of 2nd to evaluate for a subject acceleration. She took the WIAT this winter, 2 years later after doing the acceleration and a subsequent compaction.

Her WIAT scores were about 25 points higher (maybe higher as there were ceilings hit on both tests) but I interpret that as largely reflecting more exposure.

I really liked the report from the KeyMath as it gave a lot of information on exactly where her holes were.