Distance

In my view as you have already invested your 3-years in your BE so for only 1-year, why to lose an opportunity to earn. You should complete your graduation degree and can then chase your dream.

Preeti, you can not pursue two degrees from distance mode together. Yes, you can purse PGDBM from LPU, check the link below
http://www.lpude.in/programmes/frmMoreDetails.aspx?programname=Post Graduate Diploma in Business Management [PGBDM]&programcode=36

It depends on your interest.
MBA, M.Com, MFA, MFM, LLB, etc. are some of the courses that one can pursue after completing B.Com.

Hi Baneet,
Let me tell you this. MA in mass communication and MJMC just differ by the nomenclature of their names. They are same courses under different names. Some of the best colleges to pursue MA in mass communication of MJMC are provided in the link below:
https://www.shiksha.com/mass-communicatio

BBA in Aviation is good but if you will do it as a regular course. The distance learning or correspondence has very less value and also starting package and salary in aviation is very less. But, if you pursue as a regular course then you can get good placement assistance with good package also.