Computers & IT (Non-Engg)

Yes, you can apply for the MCA course at IGNOU. If meeting the eligibility criteria as given below.
Eligibility: Any Bachelors's degree of minimum 3(three) year duration from a recognized University AND Mathematics as one of the subjects at 10+2 level or graduation level; else the student is required to pursue and pass the BCS-012 course concurrently with IGNOU MCA.
If you had studied Maths at +2 or graduation level, then you need not register for BCS-012.

I am not sure if that is possible because even after 4th semester you would have taken such decision it might have been possible at the end of 2nd year however now you are in your final year that too 1semester completed so which means your practicals and projects must have been recorded by your institute and other important aspects like placement etc. Suppose even by some means if it's possible I will strongly suggest you not to take admission in any other institution. It will not be easy to adjust. I hope this helps.

There are good placement opportunities in the Doon Business School for the deserving candidate. But average is not so high as college claims. It basically starts from 2 and half lakhs and goes upto 6 lakhs per annum.

There are so many institutes in India which are offering networking courses to the students but based on their past student's reviews only a few of them are doing good in teaching networking courses. If you want to pursue networking courses then you should choose an institute which has an international background and who is a partner of Cisco. In my opinion, if you look at Koenig Solutions they have a very good background of teaching networking to their students as based on their student's reviews. If You want to look into more options then you can also check Udemy. Cloudera and Simplilearn also.