Transliteration: Allahummal Tuf bi fi Taiseeri Kulli Aseerin Fa-inna Taiseera Kulli Aseerin Alaika Yaseeru Wa As-aslukal Yusra Wal Mu-aafata Fid-dunya Wal-akhirah.
Translation: "O Allah, turn an impossible task into a possible one, for nothing is difficult for you. And I seek your forgiveness in life after death and ease in my worldly affairs"
This dua has been recommended by Mufti Taqi Usmani, brother of Grand Mufti Pakistan (Mufti e Azam) and it has helped a lot of people complete their difficult tasks.
Before you go to take the driving test:
1) Recite the dua as often as you can
2) Dwell on the meaning of this dua
3) Have full faith in Allah and His powers (think of his glorious names - Asma ul Husna - to create the feelings of full belief)
4) Start imagining that Allah has listened to your dua and see yourself in mind that you have passed the driving licence test.