Okay, I wouldn't pass it, but that doesn't matter. A kid from back then wouldn't be able to pass one of our tests, either. Why? Emphasis on what is taught. For example, I have no clue on how big a bushel is, but who cares? That doesn't make me less smart than someone who answered it correctly in those times, it merely means I have no use for that unit of measurement. I know my metric, and can convert it to imperial for a number of measurements, and that is what matters. If you'd given me metric questions of that sort back in Grade 8, I'd have been able to do it. Most certainly if my teacher was gearing me to learn specifically those things.
Because, you see, that is often how teachers teach: geared for their own exams. I see that all the time. For example, take your standard Latin Literature in Translation class, get the students to write the test I had in my class, and they'd have failed it. Heck, most Classics graduates would have. But I aced it. But does that make them stupid and me smart? Not in the least. My teacher taught, essentially, Seneca, Tacitus, Lucan, and Petronius. Now, the first two aren't odd, but the last two are. In fact, my professor focussed on Neronian works, whereas most Latin Lit classes go with the standard Augustan, I figure. But my professor knew she was teaching toward a specific set of learning, and tested us appropriately. That is the explanation. Thus, students were not much smarter then... they were merely taught a different set of skills and knowledges.
Beyond the math questions, I'd know about 50% on the grammer segments. A bit more if I'd had a teacher drilling me on the exact uses for the past year. Most of the kids likely forgot it quickly enough. US history... nope, don't know that. A bit better at Canada. But, again, curriculum. I'm absolutely certain that I was comparatively as knowledgeable. Not in US history, of course, but world history. In grade 8, I was learning the basics of the ancient world. I can't tell you what happened in 1607, but I can tell you 2400, 1200BC, 750BC, and so on (for example, even in grade 8 I could tell you the Pyramids were built in the 2400s BC, the location of the first pyramid, the pharaoh who ordered it, and the architect.) For Orthography, well, that's something that's fallen away from our modern teaching system, but it's been replaced with other things. I notice physics and chemistry is distinctly lacking.
When it comes right down to it, right now I could get probably... 30% on it? Probably a bit less. However, switch US history with world history, innane mathematical systems with metric, and the geography with something more pertinant and modern (republics of Europe? Well, I should think a child in the 1800s could name them! My sisters can name and locate the countries of Europe, which are far more numerous than the old republics), ... I could get more than 75%. In Grade 8, at least a pass. What it shows is not a genious or a stupid person, but merely a difference of focus. Even nowadays that's true. Lord J, you come up here and take a Grade 8 social test, I bet you you'd flunk, what with all that Canadian history - but what's it to you? Same thing. It can't be taken as a mark of the intelligence of the students. Nor is theirs neccessarially better.
I will, however, say that teaching has taken a downturn. I like the old-fashioned, building from strong foundations and basics approach, rather than the more flighty sort we get nowadays. But, stepping back and looking at this test, looking at its overall difficultly as objectively as I can... it's not that bad.
So I voted for the last, because my response is conditional.
An addendum, here's my proof for my thesis:
2. How do you account for the extremes of climate in Kansas?
Bingo. They were being taught specifically. I bet you not one of the kids in that class, even one who aced it, would have been able to tell me when the pyramids were built, or even when the Egyptian civilization existed. As such, I wouldn't laud it too highly The only real solution is a more one-on-one approach, that allows for open questioning. That sort of education gave us the old Greek models, but can hardly be applied in pracice nowadays.