Impossible to say as you have given no indication of your progress so far, your previous experience and the amount of training that you can put in between now and the event. The one thing I will say is that what you should be concentrating on as a goal for your first match (and every match) is Performance Delivery, not Performance Outcome. You must arrive at the match focused on reproducing the technique that you have developed in training; stance, grip, sighting, trigger technique, rhythm; not the score that you hope to achieve. Scores are the results of technique and only increase as it develops and improves.
The best general advice is to go to the match intent upon enjoying it and learning from the experience. No one is watching you, they are all too busy shooting.
ATB
Rutty