Réponse:
My dear uncle,
I am writing you this letter to let you know that I am in the last year of school, and to let you know what I would like to do next.
I would like to enroll in a school in political science, in order to get involved in political life and be able to reform things in my own way. I would like to ask you if with your influence, there would be no way that you make it easier for me to enter this school, or at least have a pleasant look on me.
I will be extremely grateful if you can do something for me, I promise to work hard and help you later if necessary.
Cordially, your dear nephew.