trouble-maker kids
Although this sounds catchy I feel as if it is a bit too informal.
The main benefit of this approach is that it allows the government to fix the issue from its root of problem
This sounds unclear. Try
This approach solves the problem of undisciplined children from its roots.I can not understand why the government needs to be mentioned here.
To be exact, parents are child's first exposure to the outside world, therefore, it is believed that parents with good attitude will pass them to their children.
To be more clear, parents are the role first role models of a child, and therefore it is only natural for disciplined parents to have disciplined children.I think another drawback would be that since no child is the same, the same approach taught in these parenting class might not be appropriate for every child. It's just an idea I think you might be able to use. :)