Passage map:
Author argues for a revision of the depiction of native americans in history textbooks by stating his argument, providing counter claims, and supporting both with evidence.

Question 1
A is correct because it accurately encapsulates the main idea of the passage without being too broad or too specific
B is incorrect because nothing is mentioned about teachers; the argument deals with textbooks
C is also incorrect for similar reasons
D is incorrect because it warps the information given by stating the opposite of what the author intended
E is incorrect because nothing is mentioned of parent's influence

Question 2
A is incorrect because "one research study" is not discussed
B is a contender answer - it's broad enough to trick people to go for it, but not specific enough to be correct. Really, only one revision is discussed - the revision of the representation of native americans in history. Also, more importantly, the passage isn't a description. It's a clear argument - the argument is contained in the last sentence.
C is incorrect because the argument is premised on the notion that history textbooks aren't accurate and that changes can be made to them
D is correct because the passage is an argument and its intention is exactly to argue that history textbooks misrepresent the history of Native Americans (see second sentence of the passage) and that the impact of this is that children walk away with a distorted perception of reality
E is incorrect because the intention isn't to Summarise. Secondly, no where is it mentioned that the Native Americans Developed political systems

Question 3
Before looking at the answers, it's important to be cognizant of any OPINIONS given in the passage. Quite clearly, the "two researchers" studies' are provided as evidence as a counter to the claim of "some researchers". They claim that students, by the time the get to high-school, know they can't take textbooks seriously. The transition word "YET" is a clear indication that a contrast is about to happen.

A is incorrect because the researchers don't suggest anything, their research is cited as evidence; second, the researchers studies' suggest the exact opposite of what A states
B is spot on with what we interpreted.
C is incorrect as it is the opposite
D is incorrect as it is not founded on any evidence
E is incorrect as it is completely unfounded

Question 4
Overall, before i look at the answers I'm clear on the tone and note it down. Initially the author is quite transparent about how he feels - he takes this stuff quite seriously and there is clear passion in his argument. In fact, it warrants me to question whether the author is native american.
The passage is an argument and carries tones that the author is UNIMPRESSED to say the least about the representation of NA's in history textbooks.

A is incorrect because this is a clear argument where an opinion is given - thus, indifference is false
B is incorrect because the author is direct and to the point about his argument - he isn't hesitant at all
C is incorrect for similar reasons
D is incorrect because its quite apparent the author takes this stuff seriously and is not amused
E is the clear answer as it encapsulates the general vibe of the author and direction his or her argument takes

Question 5
Before looking at the answers, again, be clear on the opinions used in the text - what are the authors opinions and what are the opinions of others? This is easier to do in a short passage, harder to do in a longer passage where multiple opinions may be given.
More broadly, the "researchers" generally believe that by the time students hit high-school they don't take textbooks as fact and actually form their own opinion

A is unfounded and thus wrong
B is correct because it highlights the opinion of the researchers via illustration
C is false as it contradicts the "researchers" views
D is completely unfounded as the researchers only argue that high-school students are conscious, not elementary - as implied by "by the time..."
E is completely too narrow in scope and logically irrelevant from what is stated by the researchers

Question 6
In the last two sentences the author argues that an on-going careful review of how textbooks depict Native Americans is needed because children's attitudes are strongly influenced by textbooks used in schools (as suggested by the "two researchers")

A is a lure answer. It's too specific and refers to the previous part of the passage. However, A isn't the outcome, it's the current situation - that Europeans' conquest is misrepresented in history textbooks is a fact, not a byproduct. The byproduct is that children will look at this misrepresentation and be influenced by it. Extra details on A as I stupidly got this wrong.
B is incorrect because the argument is that children are influenced by the biases and that they aren't exactly consciously aware of these biases
C is correct (it should be "form", not "from") as it provides the byproduct - that children will form negative stereotypes based on misrepresentations
D is incorrect as they don't develop an understanding, they base their interpretation from ethnocentricism
E is incorrect because it is completely unfounded