The procedure for IGNOU exams depends on the program you have opted for. My answer is related to Arts/ Science/ Commerce except for BCA. The procedure is as follows:
Register yourself into a program at Study center near you.
You will receive your study material within a month along with the schedule of classes. These classes are held at the study centre on weekends.
Internal Assessment Projects are issued by December and should be submitted by March. Prepare well for project assignments as 30% weightage is taken into consideration
Appear for June Term End Examinations
Result will be announced within 45 days