Hi,
Here are a few edits based on the above letter.
Clive
The Principal
..
......
4 April, 2008
Dear Sir,
My son, ..his name . . ., is in Grade 5. We are planning to move back to India, so he will leave school on 15th June.
We hereby request you to issue a transfer certificate to enable him to continue his studies in India. We would also be grateful for the refund of our deposit.
Thank you for your assistance.
Yours sincerely,