To beat this, there is no way except to practice coding and gain enough intuition to figure out what methods/functions do what and how things must perform. This happened to be backend related "stuff" and so after doing a lot of backend projects and work experience, it kinda becomes more and more obvious as you think about it. I just read it through several times and starting matching and asking clarification questions about what it could be. Most importantly, talk your thinking process aloud.