With the start of a new school year and parents and children all over the country thinking once more about grades and marks and passing exams, it's a suitable time to consider whether our education system is really delivering what our children and what our society need. My overriding impression after having been a secondary school teacher in the U.K. for the past twenty years is that I've been on a merry-go-round. I've seen things being introduced, then abolished, then introduced again. I'v...