I moved to America at 13. I had already had one year of HS under my belt when I got up here and was placed in 8th grade. In total I only had one standardized test from age 4 to 13.
And I was in my final 5 years I had one every year. So I have some personal experience to draw on
In America it goes slower because they try to make sure everyone gets it, and it is the teachers responsibility everyone gets it. Overseas getting it is not the teachers problem, it is the student's, especially as students get older. The drawback to the America system is that students don't learn much, and what they do learn they don't understand it at a deep level. The disadvantages of the systems in other countries is that a struggling students will get left behind in the blink of a eye.
If we go to a faster survival of the strongest system, without adjusting other things then I guarantee you that the poor and minorities with suffer. Because they resources and best teachers will be in the burbs with the rich white folk.
My recommendation is that we invest more in, a national mandatory curriculum, early education programs, lengthen the school year, pick up the pace on the material, end grade school end a year or 2 earlier, reduce testing, make teaching a appealing profession that the best and brightest want to go into, pay a premium to the best teacher to be in the under performing schools, everyone goes to community colleges, then move onto universities.
But all this is a fantasy because no one will want to pay for this.
But the thing is, under your plan, without any other changes,
More resources need to be spent on early education and making sure kids don't f