just passed mine on friday, i had failed once previously!
my main tips would be to take a 'kalm's tablet before your test as it helps you focus..
what i had failed on previously was not keeping enough distance between the car and parked cars at the side of the road, apparently you should keep a car doors distance away.
i found
http://www.drivingschoolireland.com a great resource for any queries. The best advice i got was to drive normally and not get worked up about it as the worst that can happen is you fail and retake the test a few weeks later!