Hello there. Hope you are doing good. I would like to tell you that yes there is a provision of taking admission in 6th cutoff after cancelling admission in previous college. This is a usual process which is followed by most of the students as they want to secure the seat in one of the college. Afterwards, they can opt for some other college also. You have to submit an application to the college in which you have taken admission stating that you want to withdraw your admission. Then you can fill the cancellation form which is available on the official website.

For more updates, you can refer to Delhi University official website.

I hope you found this answer helpful. Good luck for your future.