Bob Fletcher, head at Hobbayne primary in Ealing, west London, said the pressure to hit targets put children, teachers and the school under enormous pressure.
He said: "We are desperately trying to improve our league table results. At the end of the day each child counts for 2 per cent in our scores and we have targets of 80 per cent."
The 467-pupil school outperformed the national and local authority average point score last year, when 87 per cent of its pupils reached level 4 or above in English, 79 per cent in maths and 95 per cent in science. But, despite this achievement, it is just half-way up the league table for the borough.