I agree with those who have suggested as broad an education as possible...
... the trouble is that intellectual curiosity is forced out in an endless swathe of testing that serves only to generate the appearance of utility, rather than being intrinsically important. Children then stop enjoying learning, as would anyone forced into a clearly redundant & system-centric rather than person-centric activity, and the process of becoming thoughtful & curious people halts before they've matured as an individual because they associate learning with testing.
They emerge with bits of paper that enable them to get jobs (or not), or to get into university (where most of them continue falling into the same trap of thinking it's about getting a qualification/job prospect rather than expanding their mind).
Only a minority retain any sense of mental vigour, unfortunately. I was lucky that my parents, while certainly very keen on my getting all the bits of paper required, also taught me a healthy cynicism regarding the actual true value of those qualifications (a mere necessary hurdle) compared to being able to think.
Of course, as a concept, the idea of testing progress against an external standard is sound. The trouble is the quantity of the testing, and the validity and meaning of the standards currently used, at least in the UK.