To be successful in the NSW driving test, you need to score at least 90% and have no failed items. Although a perfect score is ideal, a few minor mistakes won't automatically result in a failure. Driving test mistakes are categorized into three groups - illegal or dangerous mistakes, driving errors, and low score. An illegal or dangerous mistake is an immediate failure, and you can fail even if you score 99% on the test. However, you can still pass if you make one to two driving errors, such as failing to indicate correctly or making the required observation checks. A low score, meaning a score below 90%, suggests multiple minor mistakes, such as poor steering technique, which can lead to a failure if repeated multiple times.