2 and 5 are handily down to No Child Left Behind which is frankly some of the worst legislation ever devised for education.
3 and 4: And these factors are only getting worse as worse and worse kids enter the school systems. Nobody wants to deal with them, including their parents.
Bonus: It's not hard, but we won't allocate the money. School lunch lady is a job considered a punch line because for some reason our culture thinks it's easy to serve food to several hundred people in 45 minutes when the people in question aren't old enough to buy cigarettes, but good fucking luck getting money and people allocated to actually do that.