MCA IGNOU is unquestionably difficult. Especially the third semester of mathematics. It is more difficult than regular MCA and B.tech computer science programs. Many students were unable to pay the fees for their Btech after completing their 12th grade. They could have become financially better off if they had gotten a job while also studying MCA IGNOU and were able to pay the nominal fees charged by MCA IGNOU.
Some people may have missed out on engineering graduation because they did not receive proper guidance during their 12th year. When such people enter the corporate world, they have a good idea of what they want and then decide to take a course, and the bright ones take MCA IGNOU and pass it.
The conclusion is that yes, of course, MCA IGNOU is absolutely the most difficult computer science course in India. And if someone has passed it, you can be confident that she/he is very good.