寫退學信, 望賜教!!

write something like
"Dear Principal,

I'm going to leave the school .........

I thank for the school for the teachers' guidance and support for these years, and I still remember their lessons.............

Thank You

Best Wishes,
XXXXXXX

00-0-2007"

Dear Principle,

I am writing in regard to my son/daughter (your name)'s withdrawal from school. He is now studying at ( your class). Since he/she has successfully got the permission to transfer from Chinese Section to English Section in your school, I am now urging for your permission to his formal withdrawal from Chinese Section.

Thankyou for all the teachers and staffs in the Chinese Section, who have gave my son a wonderful environment to enrich his knowledge.

Thank you for your kindly consideration,

(parent's signature)
Date

Dear principal

I regret to inform you that I will leave the school (or transfer to the English Division) from (date). Kindly let me know if there is any procedure which I need to complete.

Thank you for the guidance of you and all the teachers during my education here. I apologize for any inconvenience caused and wish the school every success in the future.

Yours faithfully

(name)
(class and/or student no.)

(Date)

(name and address of principal)

Dear principal

I regret to inform you that I will leave the school (or transfer to the English Division) from (date). Kindly let me know if there is any procedure which I need to complete.

Thank you for the guidance of you and all the teachers during my education here. I apologize for any inconvenience caused and wish the school every success in the future.

Yours faithfully

(name)
(class and/or student no.)