Answer:
firstly you write the address of your friend at the top right hand corner of your page. then since it's your friend, you could greet and ask about a few things. like how her family is doing, how her school is and all that. then you can then state the reasons for poor academic performance at the junior high school
Explanation:
some of your reasons may include;
1. lack of concentration because of the excitement of leaving the primary school
2. distance of the school to your home. stating that most times due to the distance, you get tired after getting to school therefore causing you to concentrate less
3. lack of money to buy the books needed also
4. lack of well trained teachers especially those who do not come to class and others who do not explain to your understanding.
remember, it's a letter so your points will be written as firstly, secondly and so on. then remember to add a conclusion and stress the above points.
the conclusion could be something like,
junior school was fun and I enjoyed it but the above points are the reasons I did poorly. I wish to hear from you soon.
then the closing salutation
Yours sincerely,
your name