Forget about all the prep books. Go to LR drills, sort problems from easiest to hardest, and do every single weakening question. Then do every single strengthening question. Then every flaw question.
Read the question once, understand the inferenceā¦
Took me 2-3 months of 10-15 hours per week. I pushed myself to move through it fast, wish I had taken more notes and reviewed more lessons throughout. Stay on the path!
I went cold turkey on drilling during the core. I recommend you treat all of the mini drills as timed tests (including the single question drills) and blind review everything before you move on.