If someone want to cancel their admission after du 6th cut off and he take the admission in 3rd cut off. Will the fees will refund.

Dear, yes, your fees can be refunded if you file a cancellation form on the DU website. Go on the website and check for the cancellation form, get a printout and fill it. Submit it to authorities of the respective college and pay the cancellation charges. Either your fee will be transferred to the college you take admission to next or it will be refunded to the account you have mentioned during admission. But refund will not take place instantly, you will have to wait till the admission procedures end up.

All the refunds are done on the basis of UGC guidelines.
You may check the following pdf for these rules.
https://www.google.com/url?sa=t&source=web&rct=j&url=https://www.ugc.ac.in/pdfnews/5437737_UGC-Notice-reg-Fees-refund-Eng.pdf&ved=2ahUKEwiLiZet2N_jAhUYYysKHW5OBX4QFjAAegQIBhAC&usg=AOvVaw2fGT6QWtwyYmgOAJ6yqU9K