Today 's league tables -- the last set of exam figures to be published before the General Election -- show that only half of pupils nationally gained five A * to C grades , including English and mathematics , the basic standard demanded by employers . * Grammar schools dominated the list and the top performing school in England was Invicta Grammar in Maidstone , Kent , where every pupil gained five good grades and the average student scored 764.5 GCSE points . * St Peter 's Church of England School in Chelmsford was officially the worst school as only eight per cent of teenagers gained five decent passes including English and maths . * Languages continued to suffer a sharp decline as fewer than half of pupils studied the subject to a high level at 1,262 schools and at 32 secondaries no teenagers gained a good grade . * Schools are continuing to inflate their results by shunning the three-Rs .