I'd say this is good for basic fact checking to prepare for an apush exam, with key terms/people, as most of the time it is correct. However, sometimes the answers are incorrect,(my favorite "what was the effect of the market revolution on women--correct answer 'they received equal wages'" yeah pretty sure we're still waiting on that one.) or the question is simply too obscure for studying, as you would likely not be asked something so specific. Plus, there are a ton of ads, which I know you can "pay for premium" or whatever, but given the other information I'd pay nothing out of my "equal wage" paycheck for this crap.