Diploma

Yes, you can pursue B.A. In Mass Communication after completing 3 years Diploma.

Candidates who have passed ITI from any recognised institute are eligible to apply for admission in Diploma course. The age of the candidates must be above 15 years.

You need to get admission in a graduation course and get minimum 40% score in the same. Once you clear your graduation degree, you can apply for admission here.

The eligibility is as below.
Candidates must have passed SSC or HSC and a diploma in engineering or technology or B.Sc or its equivalent from a recognized institution with 45% marks (40% in case of candidates of backward class categories and persons with disability belonging to Maharashtra State only).
Provided that students belonging to B.Sc category shall clear the subjects of Engineering Graphics/ Engineering.
Drawing and Engineering Mechanics of the first year engineering program along with second-year subjects.

Please refer to the link below:
https://www.shiksha.com/college/amp/xavier-college-of-hotel-management-bhubaneswar-48936

No, you cannot do on the basis of engineering Diploma. However, if you have passed class 12th, then you are eligible.

Yes, Diploma holders can appear for Andhra Pradesh EAMCET, and you must have minimum of 45% in your Diploma.

Hi,
The webpage of this college is silent about fees charged for various courses. It would be recommendable to get in touch with the college officials for the detailed information on the fee structure.
Regards