The main points to remember in the Irish oral exam are:
Be natural.
Don't make it sound like you learned everything off by heart. It's boring for the examiner to listen to, and you won't get many marks for sounding like a record player. Try to sound as natural as possible. The best way to do this is to learn important points and vocab, but not big long sentences. Therefore, you can make up the sentences as you go along, but still have a rich vocabulary and sound very fluent.
Try not to be nervous!
The examiner is not there to take marks off you. They want to award you with as many marks as possible, so give them the opportunity! Show off the relevant vocabulary you have learned and take deep breaths. You've studied for this long enough and your hard work will pay off.
Don't be afraid to ask questions or to correct yourself.
If you don't understand something the examiner says, don't worry! Just ask them kindly to repeat the question and they will do so for you. Also, if you notice yourself make a mistake, don't be afraid to correct yourself. If you do this, you show the examiner that you know the correct term and therefore you won't lose any marks.
Be prepared
You'll have had plenty of time to prepare for this exam, so you should be well able for it. Just make sure to have learned the most commonly asked questions (typical subjects/themes), the poems, and of course the Sraith Pictiúr. Then, in the exam, the examiner shouldn't throw you anything you haven't prepared. Easy peasy.