Subject [Write down the subject of the letter in less than 10 words]
Dear _______ [Put down salutation and name of the recipient with an appropriate title]
I am very happy to inform you that you have cleared your written test for the post of __________ [state post for which the candidate has applied] as part of the interview process conducted by us on _________ [state the day of the test]. We wish to invite you for an interview with our _________ [state the name and designation of the interviewer) on __________ [state date of interview].
We at _________ [name of company] want people like you to work for us. I am enclosing an interview schedule with this letter [state time, place, date, day of interview].