You have to add the paragraph and the sentences to have us answer lol
Yes. The punctuation is correct and it is a complete sentence. Nice job!
<span>The Principal
(School Name)
(School Address)
30th October, 2016
Sub: School Leaving Certificate & Character certificate
</span><span>Respected Mam/Sir,
</span><span>I hereby request you to kindly issue a School leaving certificate & Character certificate for me. My Class is ............. and Admission Number-........... since I have already discussed the whole issue with concerned authority.
</span><span>I take this opportunity to thank you and the staff members for the kind cooperation and support given to me during my past academic year.
</span>
<span>I wish all the success to your organization.
</span>
<span>Thanking You.
Yours Faithfully
Student Name :
Class :
Roll Number : </span>