Plan to send your letter soon after the honor student's accomplishment. Finish the letter and send it in a timely manner. Lagging on sending the letter makes the congratulations seem less sincere.
Type your address in the upper right corner of the letter. If you are writing on behalf of the student's school or another organization, use that address instead of your own. Type the student's address one line below your address, on the left side. Type the date of the letter two lines below the student's address.
Begin the body of letter by explaining the purpose of your writing the student. Reference the student's achievement directly without being vague. For example, you can write, "I want to extend my congratulations on your 4.0 GPA."
Continue the letter by further praising the student. Express your approval of her accomplishments and the significance they hold. If appropriate, include your personal experiences. Relate them to the student's accomplishments. Keep the length of the letter to one page.
End the letter by restating your original congratulations. Add a wish of future success and good luck.
Type your closing to the letter two lines under the body. Use a remark such as "Best Wishes," or "Yours Truly." Place a comma after the remark.
Type your full name four lines under the closing of the letter. Sign your signature above your name.