Before you make the kids less stupid, you deal with their parents whenever it pertains to things. Stupid kids generally come from stupid parents. I tell my kids that two D students aren’t going to produce a 4.0 kid.
As you can tell from my response to madguy, parents are morons, so you hit the nail on the head. All my boys had the dad for a teacher, which consisted of telling the class to read a chapter and do the worksheet, while he got on the computer looking for teaching jobs in FL. Highly successful in that search, there is a nearly 10 year gap between my oldest and youngest.