I went through grades 3 through 5 with a skip of 4, with a group of 8. It was standard back in the 60s. Then it stopped. I also was able to do a skip through high school, because you can. I don't think social skills were an issue, it was probably more the times. Drinking age was 18, so there was a lot of drinking in high schools then. So the exposure wasn't good.

I just put my kid in private school for gifted kids, 7 through 12