There are issues in norming standardized tests for kids 5 and below. They're not given to a population as large, and they can show significant differences in home environment and tolerance to testing rather than cognitive ability.
In my kid's school district, a 5yo would have to blow the lid off the test (99.5th percentile) to qualify for gifted services, but at 6 the services become far more accessible.
The question I'd be asking myself in these parents' shoes is this: which score seems more representative of my kid? The 145, or the 122?
