I had the same trouble as you at first. Try this approach:
Before you start the game, draft out a few graph possibilities and plug in the various possibilities that come to mind of how the letters can be organized based on the rules they give you.…
I just took the August one too. The RC for this test killed me....I felt like I had to reread the passages twice to grasp what was going on. I'm generally weak in RC and LR.