Level 3 help

So I'm just begining to prepare for the Aug 26 exam and honestly I'm lost. I've seen many people say that L2 was the hardest out of the 3 and many others saying otherwise.

I'm mostly scared about the CR question, can someone tell me how should I go about answering them and what are these buzz words everyone keeps talking about?

Also any tips are appreciated that you guys might've found helpful!