What type of schooling options are you trying to decide between?
Fwiw, our experience of testing a four year old (who exhibited similar attributes at a similar age to your son) was rather unsatisfying. This was partly due to the tester's limited experience with children like this, but largely due to ceiling effects, developmental idiosyncrasies and age-appropriate immaturity. So we established a floor rather than a ceiling, and some parts of the tests were hindered by motor skill issues. Our son tends to develop major new skills in step functions, and at just-turned six would possibly have a very different sub-test profile from the tests administered 13 months ago. One more factor to consider is that DYS requires scores that are no more than a year old, but will only accept children from five onward, so testing before age 4 might not be optimal. Additionally, most test instruments require a lengthy break before re-testing.
You might find it best to go with your gut on early education and test later when the tests are more likely to be truly illuminating. When we faced a similar question about education at a similar age, we were most drawn to Reggio Emilia and Montessori philosophies. We landed at a Montessori school where DS has been very happy and the curriculum and teachers have been very flexible, allowing radical subject acceleration while working at his own pace in a multi-age classroom. But implementation of Montessori can vary and some schools are much more rigid, so finding the right fit will depend on the individual school and especially on the principal. The best advice I was given about early education was to seek out schools that emphasize social justice because they tend to be most oriented toward meeting each child where they are, differentiating, accepting diversity, and serving individual needs.
Good luck!
