Not sure if this is going to help much but for me, the way I memorized the groups was through consistent application through questions, and repetitively phrasing it inside my head whenever I see a logical indicator on a question, e.g. when I see "the only" I would say to myself "the only = group 1, sufficient"
Alternatively, you could review the cheat cheat every night before going to bed. That helped me too!
I agree with @nye8870 . Flashcards are definitely helpful. Everyone is different so find what works best for you and commit the concepts to memory by studying them ad nauseum. The indicators are so important that you can't afford to not be able to recall them on the spot everytime... almost without even thinking.
I think it's also useful to know a couple of "stock" examples for the logical indicators that are tripping you up.
For instance, you can rely on "no cats are dogs", "the only kids in class today are boys", "the car will crash unless it is repaired," as examples that you can fall back on because you know how to diagram them already. Try coming up with your own examples!
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Alternatively, you could review the cheat cheat every night before going to bed. That helped me too!
For instance, you can rely on "no cats are dogs", "the only kids in class today are boys", "the car will crash unless it is repaired," as examples that you can fall back on because you know how to diagram them already. Try coming up with your own examples!