[UPDATE October 6, 2016: For some reasons the re-registration window for January 2017 semester is still open.]
Last Date to Re-register for IGNOU January 2017 Semester : September 30 2016, or Today.
Suppose, your registration for certain papers/courses has ended/elapsed.
If you want to appear in those papers in June 2017 TEE, then September 30 2016 is the last date to re-register. The Re-registration fee per paper is Rs 1500/-.