My brother's friend completed his BCA from IGNOU. Recounting his experience, he told me that it was very difficult to adapt to the self-learning environment. He failed consecutively in all three semesters in the beginning. He was on the verge of giving up.

He realized that the study material provided by IGNOU is actually designed for self-study. He made notes, researched and practised a lot and he was able to complete both BCA and MCA. He said that it was self-study that helped me achieve my goal. 

If you want to get good marks in IGNOU you have to focus on your self-study sessions more than anything.