Although there is no specific prayer for such an occasion in our liturgy that I know of, you can always feel free to talk to God in any way you see fit!
While many Jews use poetry and creative writing to develop their own prayers in Hebrew, English and many other languages, you can also simply just talk to God.
Here is an example of a prayer that I wrote for such a time:
Source of blessing and knowledge, please wrap me in Your Sukkah of Peace, Sukkat Shlochmecha, as I take my upcoming exam. Although I studied in the classroom and on my own, I need You, Avini v’Malkeini, my parent and my sovereign to help me maintain courage and faithfulness in myself. Please be with me as I embark on this task, for all knowledge is Your knowledge. And all knowledge is torah.
Atheists, Jews, Buddhists, Hindus, and everyone else who doesn’t believe in Jesus Christ will not inherit the kingdom of heaven. Please, turn from your ways and come to the lord while you still can. Repent, free yourselves from your sinful bondages, and spread the gospel. Trust me, you aren’t guaranteed tomorrow.⏳⌛️⏲
One of the best-known blessings, recited at special occasions and at every holiday of the Jewish year, blesses God for keeping us alive to enjoy this moment: “shehecheyanu”– Who has kept us alive, sustained us, and brought us to this moment.“ This life-affirming blessing often stirs deep emotions as we realize how thin is the line separating being from nonbeing and how dependent we are on forces outside of ourselves and beyond our control.
Entering Jewish Prayer: A Guide to Personal Devotion and the Worship Service by Reuven Hammar (pages 4-5)
In Uman, Jewish men gather near the grave of Rabbi Nachman of Breslov, one of the great sages of the Hasidic movement, who died in 1810. Every year tens of thousands of Jews make a pilgrimage here at Rosh Hashanah, the Jewish New Year, hoping to receive his blessing from beyond the grave.
Leonard Nimoy, who played Spock on the original Star Trek series, died today. Nimoy invented the Vulcan salute himself. He was inspired by the Jewish Priestly Blessing he had seen at an Orthodox synagogue.