I still don't understand why we've been trained this whole time not to use outside knowledge and now this lesson is undoing all of that...

No because what do you mean "the only" is a sufficient condition in Q3? If that's not a listed word and necessary has all the "only"s then how would we be expected to figure that out.

My confusion is where the line is drawn. Take Question 4 where being expected to make tough decisions is different from making them. That logic lead me, in Question 5, to believe that commanding magical energy is different from CONTROLing it. But that's not the case. Determining what can be grouped together seems subjective and where errors will occur.

How do I know when it's one premise vs two/does the matter? For example, given that Question 2 is 2 separate premises, I would have assumed that Question 3 would be 2 premises as well: 1.) "Since the residents' reviews about the new park have been exceptionally good" and 2.) "because this park is vital for their community interaction" rather than one combined premise.

Good luck everyone!