Dual

No, it does not offer M.Com along with Ph.D.
Refer the link to know about the programs offered by Central University:
https://www.shiksha.com/university/central-university-of-karnataka-karnataka-other-32702/courses

Amity University Noida is better for BBA+ MBA integrated course
BBA + MBA
This is a unique programme, the structure of which has been pioneered by Amity International Business School (AIBS) The programme is designed to nurture the managerial qualities and equip the students with polished behavioral skills, a deep and practical understanding of cross-cultural management, knowledge of a foreign business language, exposure to multiple platforms for International Industry Interaction, world-class teaching and infrastructural facilities.

Hi Himanshu!
No college provides coaching for IAS. You need to prepare for it either through self-study or you can take coaching classes for the same. If you're interested to pursue some integrated degree, you can consider these universities that offer integrated courses:
Amity University
Manav Rachna University
Christ University
Jaipur National University
GITAM University
Lovely Professional University.

Go for guide for journalism and mass communication 2018 by Arihant. It is one of the best sellers.

Please clarify in which exam. Question is not clear.

Coming to the placements at VIT Vellore, it is awesome, and even we got a place in Limca book of records in the latest released records. We get more dream offers that is above six lacs per annum. Mainly for this branch, we'll have an additional benefit of the post graduation degree in the hands, so we had a great chance of placing in good companies. But it creates the problem when all the branches of VIT like Chennai, Bhopal, Amravati are dumped in Vellore for the placements, and you can't say hundred percent placement, but worthy ones will have many opportunities.

No, you can't, when you pursue one course in one college your class 12th mark sheet and other document are to be submitted during admission process. At one time, you can't pursue dual course.