Form 108

yes. it is necessary to submit letter of condonation along with condonation of 100 rupees. (if submitted within 60 days )

the letter should be on  the letter head of the principal
 

YES IT IS TO BE SENT.

IT IS TO BE SIGNED BY PRINCIPLE 

there is no need to get it signed by your principal if the delay is from your side, u jst have to write a simple condonation letter and submit it togather with the fees and duplicate copies of the form