I recommend you ask some people that are in that AP class in your school. Because in my school AP US is the hardest AP class. On the first day they already had a test and had to know all the presidents in order when and for how long they served where all the states on the map where and I think the constitution. However I know in another hs it's a lot easier. So it all depends on your school. Ask around and find out about the teachers that teach AP US.
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