High-achieving students typically have parents who

High-achieving students typically have parents who "are involved throughout their child's education."
Students with parents who are associated with their school have a tendency to have less behavioral issues and better scholarly execution, and will probably entire secondary school than understudies whose guardians are not engaged with their school. Positive impacts of parental contribution have been shown at both the rudimentary and auxiliary levels over a few investigations, with the biggest impacts frequently happening at the basic level.

I believe the answer is: are involved throughout their child education.

High-achieving students tend to develop a discipline habit that most likely thought by the parents at their homes.
One downside of the high parent involvement would be that sometimes the parents might put too much pressure for the child to have a high achievement.