اللَّهُمَّ إِنِّي أَسْتَوْدِعُكَ مَا قَرَأْتُ وَمَا حَفِظْتُ وَمَا تَعَلَّمْتُ، فَرُدَّهُ عَلَيَّ عِنْدَ حَاجَتِي إِلَيْهِ
Allahumma inni astawdi'uka ma qara'tu wa ma hafiztu wa ma ta'allamtu, faruddahu 'alayya 'inda hajati ilayh
O Allah, I entrust to You what I have read, memorized, and learned. Return it to me when I am in need of it.
Recite after finishing studying
This dua asks Allah to preserve what you learned and help you recall it when needed, especially during exams.