The passing marks in IGNOU for any subject are as follows:

• Theory - 35 out of 100; 18 out of 50

• Assignments - more than 50% ( 50 out of 100)

If you get 35 marks in theory out of 100, this means you have passed in that particular subject and don't have to appear for exams again.

But if you score below 50 in assignments, then you have failed and will have to resubmit your assignments.