How to Tackle Abstract Reading Comprehension

I've typically noticed that RC is usually pretty strong for me, with an average of about -2 to -3. However, I just did PT 65, and noticed that my scores tanked. I don't want to treat this as one test's score, especially because I know that more recent section are reflective of the increased difficulty of RC. What strategies should I take to make sure harder passages don't trip me up? Thanks!