Homeschoolers tend to outperform their regular school peers. But I think parental involvement is a significant differential and is probably contributing to the outcomes.
"Descriptive analysis reveals homeschool students possess higher ACT scores, grade point averages (GPAs) and graduation rates when compared to traditionally-educated students."[2]
[1]https://www.educacaodomiciliar.fe.unicamp.br/sites/www.educa...
Yes, homeschooled kids do better than the average. The average is also dragged down by the country deciding that if your parents are poor you should starve.