Write a letter to your friend wishing him the best of luck for the examination.
My dear friend,
I hope you are doing fine. I am also well here. I am writing this letter to you to wish you good luck with this upcoming final examination.
I know how hard you have been studying and how much effort you have put into preparing for this final examination. I want to let you know that an exam is not only a test of your academic knowledge, it is a test of your stability, courage, and calmness. I am very confident that you will do well on your examination and brighten up our family. Stay focused, trust yourself and always remember that this is just one step on the path to your success.
I wish you the best wishes and very good luck with your upcoming examinations.
My best regards to your parents,