Hello. We are at the beginning process of our journey, and would like to get some advice.

Our son is 8 years old and is currently in third grade. We had always suspected that there was something about him but his development didn't seem too abnormal, he just learned stuff quickly. The school district screened for GATE in second grade. He took the OLSAT-8 and scored 99-9 in both verbal and non verbal. After that, we enrolled him in the CTY talent search, and he scored 96 percentile in quantative. His verbal score is much lower but I think that's because of limited vocabulary since English isn't our first language.

We learned all this about 4 months ago and that got us started thinking about providing additional challenges. It's like something turned on in him. In 4 months he completed 2.5 grade levels of epgy math, currently at grade 5.5. He passed the pre-test for prealgerba in AoPS. In reading, we let him go to the library and choose his own books (in the past we were giving him books that we thought were appropriate for him). When I look up the books that he chose on his own on scholastic website, they appear to be somewhere around grade 5 - 7. In the school administered test at the beginning of third grade, his oral reading fluency was 240+ wpm, silent reading 300+ wpm, comprehension scores were almost perfect (forgot what they were called).

Socially he had absolutely no issues. Plenty of friends, do silly stuff like 8 year old, plays two sports. Based on our reading / research over the past four months, we are very thankful for that.

He already qualified for GATE and the school is willing to discuss an IEP. At this point, our primary goal is to provide the best environment that will enable him to develop. The question is - what is the best method? We live in a tiny school district and they seem very open to incorporating our input into the IEP.

Some specific questions
1) Does he seem like a high achiever or maybe he has high IQ? I have read conflicting opinions about the OLSAT being an intelligence or achievement assessment.
2) Does it make sense to do individual IQ test, and if so which one? This will be self-pay but cost is not an issue if it's worth it. What can the IQ test tell us above and beyond the testing that had been done so far?
3) Where can we find additional advice on advocacy / best practice? DYS seems like a good source and that's partly why we are considering an individual IQ test.

If there is other advice, or any feedback from parents back when you were starting this journey, things that you wish you would have done if you had known etc., we would love to hear it.

Thanks!