Du'a for success in an exam or interview: (My course is) comely patience

فَصَبۡرࣱ جَمِيلࣱۖ وَٱللَّهُ ٱلۡمُسۡتَعَانُ عَلَىٰ مَا تَصِفُونَ

Fa-sabrun jameel, wallaahul musta'aanu 'alaa maa tasifoon

(My course is) comely patience. And Allah it is Whose help is to be sought in that (predicament) which ye describe

Qur'an 12:18 (Yusuf)