Basically what nate said. You need to blind review and analyze what makes the right answers right and wrong answers wrong. I personally used a spreadsheet for this and it was pretty helpful.
I wrote it recently and can give a bit of insight.
The writing section essentially presents a scenario and then asks you a critical question about it. You then go on to write an essay and argue for a certain thesis. You'll have 4 sources that LSAC …
Given that you've identified NA/SA/Flaw as weak points, I think that's a great start. In my opinion you should take a look at your process and see what's going wrong.
For SA questions find the premises and the conclusion then find the gap. The corr…