Flaw questions on the LSAT are many things, but unpredictable they ain’t – LSAC loves to use variations on the same flaw, over and over. (That’s one of the reasons why the LSAT is such a learnable test.) Obviously, in order to effectively tackle Flaw questions on the LSAT, you should have a good understanding of the flaws themselves. However, it’s also very helpful to know things that are very rarely flaws – things that show up frequently as an answer choice, but are almost never the correct answer.
Quantifiers. Some LSAT students think they’re the enemy. Blueprint classes cover quantifiers (some, most, all, and the valid inferences that can be drawn from those claims) in lesson 3 and it’s a lot of new material at once. It can be scary. But it’s worth getting it down. You’re likely to see quantifiers on a small handful of questions on the LSAT. Having quantifiers down can keep those questions from tying your brain in knots. If you have to figure them out on the spot, it’s not easy. If you know what you need to know, it makes things much more straightforward.