Are our kids just getting more clever?

According to Richard Tomkins our kids are getting better A Level results because, a) A grades are now given out according to an absolute and not proportional measurement and b) they are just getting better at doing tests. But he notes, there is an absolute ceiling for performance, and we might be more concerned at a) the unwillingness of youngsters to study sciences (despite the omnipresence of scientific method in popular thought) and b) the need to engage in other forms of activity besides apparently endless cognitive development.