Use your Christmas exam results to your advantage
Whether you did well or not in them, doesn't really matter in the long run. They won't count towards your final grades in the state exams and I can tell you for sure that you won't even remember them in a few months time. Instead, just use the results as feedback and a guideline for what you need to do now.
You didn't do so well in Irish? No big deal. You know now that that's a weaker subject of yours and that you now need to start putting in more effort, maybe adding in an extra half hour of study each evening in order to improve for the next set of tests. You did great in English? Brilliant, well done. Use that result as a motivator and form of encouragement for what you can achieve and what you're capable of. But always keep in mind that you need to keep practising/studying a subject for your competency to stay high. If you get a high mark and then think, "Oh well I don't need to study this anymore now", you're setting yourself up for disaster and disappointment. Repetition and perseverance is everything.