Writing An Official Mail

Dear all,
I am chetana..
Plaese let me know some tips how to write an official mail and how to develop skills in attempting questions to get through written exams.
Because of which i could not get through an interview.

Hi Chetana,
I am giving you this basic pattern (as per my knwlodge and exp)
Date:
To
The manager or .............
Company name
Location
Sub:
Referrence:
Dear Sir/madam,
This is for information / Myself .......... (u can start with 2 lines of introduction)
next para
closing para
Thanks & Regards
Your name
Enclosed : (if any)

Dear karanamchetana,
Always do have the habit of searching this forum before you post a question. There are lot of sample letter format which would be of some use.

CITEHR is there y should u worry. there are lot of templates for writing all kind of official letters