For appling first time for passport need bonafide certificate?how to write letter to the princepal

From,
(your address)

To,
The Principal of -College name,
(College/school/institute address)

Respected Sir/Ma'am/Principal,

  I, (your name) , studying in -college name- , grade 10(or whatever it is), ______ (your nationality) passport holder (passport number) need a bona fide certificate in order to extend my visa (or whatever your need it). So I kindly request you to give me my bona fine certificate as soon as possible.

  THANK YOU

  Faithfully
  (--your signature)
  (your name)
------

well... I don't know if  thats how you really write it. I've been writing like that for years. You just have to include everything that you want your bona fide certificate to have in that letter. If you want you can say that your the daughter of blah blah or you were born on this year. I hope this helps. If you find it difficult to understand I'll write down a sample hehe

From,
    Angel
    (my address)

To,
    The principal of "------"
    (college address)

Respected Sir,

  I, Angel, daughter of Devil, studying in INSTITUTE OF TECHNOLOGY, class 5.0, Maldivian Passport Holder No A 4923647 need a bona fide certificate in order to extend my visa. I Kindly request you to provide me a bona fide certificate as soon as possible.

  THANK YOU

  Faithfully,
  (--sign)
  Angel