Unfortunately, if you have poor worth ethic like I do; nothing can prepare you for listening than sheer practice. I would, however, advise familiarising with a few place names and cities and aim to improve any minor grammar rules such as the Aidiacht Shealbach just to at least secure a few marks for Irish.
But judging by your practice; I would advise focusing on the former. Maybe consider really developing an ear for Irish through immersion in other sources such as listening to TG4 and what not.
Its up to practice. Once you get your paper you scan through the questions and try and translate them and figure out what is the question asking me. Highlight/underline key words and listen out for thise key words to get your answer. thats what i do anyways. hope it helps.