Cancelling a demand draft that has already reached the college can be tricky, but it might be possible depending on the college's policy and how quickly you act.

Call the college admissions office or the department you applied to and explain your situation clearly. Mention that you want to cancel the demand draft and inquire about the process.

Politely request if there's a way to get a refund on the demand draft amount. Be prepared to explain why you need to cancel your admission.

The college might have a refund policy in place that outlines the conditions and timelines for getting a refund on admission fees paid by demand draft.

Since the classes haven't started yet, the college might be more considerate of your request compared to a situation closer to the semester start.

• Refund with Deductions: The college might agree to a refund but deduct processing fees or a cancellation charge.
  
  
• No Refund: In some cases, the college might have a strict policy and not offer any refunds on admission fees after the demand draft is submitted.
  
  I hope it helps!