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passing scores of 3, 4 or 5
In computer science, passing scores are 11, 100, and 101.
Given modern experimental evidence that wild foxes can be domesticated in a few generations (that includes physical changes, most notably non-erect ears), multiple site domestication is quite plausible.
There are also several modern examples of wild fox newborns raised as pets without significant problems.
They measure success by how long you stay on their page. The slower it runs, the harder it is to get it to do what you want, the longer you stay on their page.
You're telling me that the teachers are so poor quality that if they don't teach the material that will be on the test and nothing else, the students won't pass the test. Teachers that poor should be fired. There are a great number of people in the general public who need jobs and could teach better than people currently employed as teachers; they'd have the additional advantage of not already having their minds corrupted by the garbage that teachers learn in normal schools.
A student who has learned nothing in a year has been seriously damaged by his teacher, who should be fired before damaging other children.
Tooth decay starts early. A great deal of it occurs before puberty, during which time children crave sweets and haven't really gotten the knack of good teeth brushing. Optimistically, 42% of Americans have had a cavity by age 11.
The idea that primitives don't live long enough to have tooth decay problems is silly.