Your sister has gained admission in to your former school. Write a letter giving her information about the school and advise her on how to behave well while in the school.

I can help you with the body of letter

Explanation:

i hope u r in good condition . I felt glad to know about your excellent result this year and got admission in my school. I feel proud of you since u always word hard . After getting admission in this school,you must know some things for adjustment. Here, teachers of best qualifications are provided and studies get tougher in higher grade . So, u must start working hard on the very first day , otherwise it will get for u later. We follow a hard time table of periods so u need always to be active and fresh . Teachers are best at teaching and extra curricular activities are also held here monthly . u must know that if u get absent , u will get scold . it is strict school but excellent for studies. u need to behave well in the classroom and don't fight with others . So all the things I have told u , u must obey them .Give regards to mother and father

well for some you have to do on your own on a paper but yeah