Write a letter to your friend asking him to help you in your studies.
Sender's address
Date dd/mm/yyyy
Receiver's address
Dear Anand,
I hope you are doing well, We are all well here. I am writing this letter to let you know that I need a favor from you As you know that I am pretty weak in English and you are good at English. Therefore, I thought if you could come to my home and stay for a week as summer vacation is commencing next week and help me out with my English. I thought why not utilize this vacation for good reason. You are also weak in mathematics and you know that I always got the highest mark in maths. Thus I can help you out to get clear all your doubts in maths. During this time, we will also get to know each other.
I will look forward to your letter. Please pay my regards to your parents.
Your lovingly
Rohit