As stated on Gammaprep, a full refund of the enrollment fee will be provided (after deducting 3% payment gateway charges) if a cancellation request is made within 3 days (72 hours) of enrollment.

Refund requests made after this period will not be considered under any circumstances.

User will be able to cancel the course within 3 days of enrollment without bearing any charges*.

Please go through the complete terms and conditions for the cancellation policy