Dear Samiksha,

Hope you are doing well.

Yes, dear in case if it's supposed to submit yearly and if they haven't recieved or looked for your assignment you need to  re-submit it but you can contact them or you can visit your study centre and contact them about your query. In such cases, some faculties are very cooperative they can help you with the assignment issue. Or you can visit the main campus of IGNOU or else you can contact them online through their help centre numbers or general contact numbers. Infact, you can mail your class teachers also in case if they can help.

Hope this helped.

All the Best!!