AsalamuAlaykum Warahmatullahi Wbarakatuh,
Bismillahir Rahmanir Rahmeem
Dua Before Studying
Allahumma infa’nii bimaa ‘allamtanii wa’allimnii maa yanfa’ unii.
O Allah! Make useful for me what You taught me and teach me knowledge that will be useful to me.
Allahumma inii as’aluka fahmal-nabiyyen wa hifthal mursaleen al-muqarrabeen.
O Allah! I ask You for the understanding of the prophets and the memory of the messengers, and those nearest to You.
Allahumma ijal leesanee ‘amiran bi thikrika wa qalbi bi khashyatika.
O Allah! Make my tongue full of Your remembrance, and my heart with consciousness of You.
Innaka ‘ala ma-tasha’-u qadeer wa anta hasbun-allahu wa na’mal wakeel.
(Oh Allah!) You do whatever You wish, and You are my Availer and best if aid. Protector and the best of aid.
Dua After Studying
Allahhumma inni astaodeeuka ma qara’tu wama hafaz-tu. Faradduhu ‘allaya inda hagati elayhi. Innaka ‘ala ma-tasha’-u qadeer wa anta hasbeeya wa na’mal wakeel.
Oh Allah! I entrust You with what I have read and I have studied. (Oh Allah!) Bring it back to me when I am in need of it. (Oh Allah!) You do whatever You wish, and You are my Availer and Protector and the best of aid.
Dua While Studying Something Difficult
Allahumma la sahla illama ja-’altahu sahla wa anta taj ‘alu al hazana etha shi’ta sahla.
O Allah! Nothing is easy except what You have made easy. If You wish, You can make the difficult easy.
Dua For Anxiety
Allahumma inni a’oodhoo bika minal-hammi-walhazan. Wa’a oodhoo bika minal-ghammi-wal-kasal. Wa’a oodhoo bika minal jubni wal bukhl. Wa’a oodhoo bikal min ghalabatid-dayni-waqarir rijal.
Oh Allah, I seek refuge in You from worry and grief, from helplessness and laziness, from cowardice and stinginess, and from overpowering of debt and from oppression of men.
Dua For Distress
Allahumma rahmataka arjoo falaa takilnee ilaa nafsee tarfata ‘aynin wa aslih-lee sha’nee kullahu, laa ilaha illa anta.
O Allah! It is Your mercy that I hope for so do not leave me in charge of my affairs even for a blink of an eye and rectify for me all of my affairs. None has the right to be worshipped except You.
Sorry bro, i don't have the arabic, but there is the transliteration and the meaning in bold!
I hope you pass you exams without difficulty, May Allah (swt) Make it easy for you.