These sorts of articles always smack of cargo cultism. First we say "Holy crap, country
X is doing better than the US in standardized test
Y!". Then we pick out all the ways in which country
X is different from the US. Then we throw out the ones which we don't like and assume it
must be the other ones which are responsible. Therefore, if we hold childrens' hands more then they'll do better in tests and if build a big flat area in the middle of the jungle and wave sticks in the air then a giant metal bird will land and bring us cargo.
The answer to the question of how to improve US education is obvious to everybody... unfortunately the obvious answer always seems to differ depending on whom you're talking to. Teachers' unions will say that the answer is to pay more money to teachers. Anti-union activists will say that the answer is to get rid of teachers' unions. The left will say that we need more redistributive taxation, while the right will say that we need to implement market-based reforms to force schools to compete with one another. And racists will say that it's unavoidable that the US will do worse than European countries, because the US has so many black people.
Problems are relatively easy to solve when political agendas are involved, but once you get to the stage where everybody is simultaneously shouting "This new piece of evidence clearly shows that my political agenda was right all along" then problems have become completely insoluble.