Khan Academy Behavioral

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Sep 9, 2013
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Before each section in the Behavioral portion of Khan Academy videos, there is a question section. In these questions, the sometimes have options or test on things not covered in the videos? It's making me extremely nervous as I see things like "Inter-rater reliability, Retest reliability, Predictive validity, Content validity" or "Flynn effect" or even simple research statistics such as a "+1.34 indicates:" and I can't answer them. They're not in any of my sets either (EK and Kaplan), and it just makes me think what else am I missing out on.
Can somebody guide me to either:
1. Where they found those topics in Khan (maybe, I missed it).
2. Which set was the best in terms of Behavioral