My DD6 hated being quizzed and often gave completely wrong but rather witty answers whenever she felt offended or slighted by being asked obvious questions like 2 + 2. She had to be tested when she was 4.8 for K admission and she did fine. on IQ tests. For a school readiness assessment that involved naming letters and numbers, apparently, she was very disrespectful and downright sassy.
She is 6 now and I think she would be a lot more compliant. I'd wait unless you have compelling reasons to test now.
