> I held her back a year in preschool This (or backing up a year any year) might have helped you too. > and put her in a private school that mixes multiple ye

> I held her back a year in preschool This (or backing up a year any year) might have helped you too. > and put her in a private school that mixes multiple years in the same differentiated class. This might backfire, for the same reason that you had trouble -- differentiation is difficult to do in practice. And your childhoold school might have been less differentiable than a modern public school, which has the benefit of computerized material and automated adaptive tests. Of course, if the private school solves it by having a far lower student:teacher ratio, then of course that's better than a public school, all else equal. Another thing parents can do is, instead of switching to private school, put that money toward hiring PTA-sponsored assistant-teachers in the classrooms.