This question helps to disguise the real issue in the same way as these exam results disguise the same important issue. That issue is the intelligence of the population, and the fact that it is dwindling significantly with each oncoming generation. Everyone who is honest with themselves has noticed it.
Incompetence is rife.
If workmen are hired to do a job, all too often it is a botched job. Teachers and lecturers complain of soaring levels of illiteracy, which cannot all be explained away by misguided and ineffective educational techniques. Each new year, admittance into secondary schools contains many more pupils than the year before who can neither read nor write and who lack basic skills in numeracy. University lecturers frequently find that they must attempt to teach new students the grounding in subjects which were insufficiently taught at school. The speed of the decay is gathering a rapid momentum.