Hello there,

It means you've send the income certificate of previous year. The validity of income certificate have to be renewed per year. That's the reason that college have sent you a mail to submit your Income Certificate of the Financial Year 2024-2025. The Income Certificate should be issued on or after 1 April, 2024. Thus, you need to submit Income certificate of this year to the college.

You can refer to the pdf issued by University of Delhi , to get more details on the admission process of NCWEB 2024-25.

https://admission.uod.ac.in/userfiles/downloads/UG-NCWEB-English.pdf

I hope this information helps you.