Question

write a letter to your younger brother / SISTER Encouraging him / her to work hard for upcoming exam

Answer 1

Dear sister, 
I am aware that you have an upcoming exam and yet you don't seem like you've been studying or working hard at all. 
Now, I write this to you with concern for your future and full sincerity, and as I do so I do not wish to insult you nor to hurt your feelings. 
Exams can be tough, believe me, I know this from experience, and now that you have an upcoming exam I only think it's fair that you know how tough exams can be. 
Imagine all you've learnt in class, all of the homework you did and the practice problems you did. They were okay, weren't they? Now, multiply the difficulty by ten and you will get what an exam question would be like. 
If you're already struggling with the practice material there is almost no chance that you would do well in your exam. 
In order for you to do well, you must work hard, and study as much as you can until you know everything by heart. And once you've accomplished this you can slack off and do as you wish, without having any worry or apprehension in your heart. 
With love, 
Your sister

Hope this helped :)
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Answer 2

10/3/18
Dear pushkar
I am fine here and hope you also be fine there . pushkar I listen that from tomorrow your exams will happen .
You have to study hard and I know you can do that .
Your brother
Utsav