Hello,

From your profile it seems you're an engineering aspirant of class 12th, hence I presume your query is regarding undergraduate courses, see depending on the specific course structure, it may be annual system or semester wise, in case of former if you have enrolled in July 2021 then you will be required to appear for June 2022, and prior to it you have to submit your assignment, similarly if your course is semester wise then you will have to appear for December 2021 an submit the assignments prior to its, and regarding the submission details IGNOU doesn't inform you regarding this through any channel of email/sms whatsoever however you can stay updated at https://webservices.ignou.ac.in/assignments/ for more details regarding this.