The last date for applying of Re-Registration for July 2018 is 15.06.2018.
The online RR Link can be accessed at; https://onlineadmission.ignou.ac.in/onlinerr/
Re-registration means registering for next year/semester of a Programme. So it is applicable only to students enrolled in undergraduate/postgraduate programmes of two-three year duration.
You can re-register for the next year/semester of your Programme irrespective of whether you have submitted the assignments or appeared in the term-end examination of the previous semester.
For further details please visit University website www.ignou.ac.in.