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Sometimes kids with very high IQs do worse in school than kids with IQs that are high but not gifted or HG high.

Definitely! This can sometimes happen. I'm just not a fan of "The kids who do best in school are pleaser kids who aren't really all THAT smart" blanket statements. (Although my DD didn't, in fact, test stratospherically high. But I also base this on my observations of her classmates. Some of the kids who are doing really well are pleasers. Some are just really sharp. Some of the kids with lower grades are out-there kids who may not be doing well due to 2e, no desire to please, etc. Some are probably just on the lower end of gifted or less motivated. I don't see a single unifying pattern, and FWIW the child who stands out as THE best student (not my DD) also stands out as most likely one of the most gifted. She's just on another plane. Also an athletic and musical superstar.)