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I seem to do quite well in the lr sets, up until question 19 or 20. I usually miss 3 to 4 of these last few questions. No pattern in types. How do I get these last few correct?

If there is truly no pattern in types for these last questions, then it's hard to give very specific advice other than to perhaps budget more time towards tackling them early, and also consulting Powerscore/Manhattan Prep forums to see their explanations for the questions you get wrong.