If you want to understand the instructions, firstly recognize your weaknesses. Driving is nothing if you know what area you lack in.
Always be alert about these: doors, seat, steering, seatbelt, and mirror.
Don't waste the whole test seeking to assume whether you have made a mistake or not, just focus on your driving.
Never underestimate when your instructor is explaining something to you. What he or she is saying is very important for your knowledge of the road.
Get enough sleep the night before your test, don't forget to eat breakfast on time. Refrain from planning anything else that day. Be cool and confident about yourself.
If you're confused during your test in front of your examiner don't bring yourself down. Your examiner will guide you.