Alternative Investment questions difficulty, understand, Investment

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I don't understand what LOS CFAI EOC 11 and 12 relate to or if we're expected to perform those calculations. The Sortino ratio wasn't even mentioned in the Schweser reading at that point.

Also, I don't understand CFAI EOC #26. What I remember from other questions was that alternative investments exhibit positive skewness and kurtosis. Why is the answer positive skewness and kurtosis?

Another difficulty that I have with this reading is trying to remember what goes into the biases for the different benchmarks and their construction. How are we supposed to keep track of them?