I agree that it can be confusing/intimidating at first. Keep in mind that this year, you won't actually have to use the JS9 software in competition, just be able to understand screenshots of its various functionalities.Do you know of any good resources to learn how to use JS9? It's seems confusing and I'm not sure how to answer questions about it.
I wrote a very basic-level introduction to JS9 here. Beyond the guide, I think it's helpful to play around on the site and see what it can do. To perform well on JS9 questions at high-level tournaments, be sure to also understand fundamental concepts in multi-wavelength astronomy, energy spectra, light curves, etc. The goal of JS9 is to be able to apply theory to understand observational data! In case you haven't seen it, there's a JS9 question on the MIT exam (see #19) and detailed solutions here, so that might give you a feel for what sort of questions to expect.