Colleges in Chennai

It doesn't accept CMAT but only accepts CAT with 86 percentile and XAT with 80 percentile:
https://www.shiksha.com/mba/course/post-graduate-diploma-in-management-loyola-institute-of-business-administration-nungambakkam-Chennai-187300.

Anna University is not recommended as it is not featured in top 50 colleges and placements have been ambiguous due to its lack of branding.

It all accounts to one thing, don't expect an average placement of more than 3.5-4 Lacs. There were some of the companies that visited campus during the year 2017. PwC, EY, SAP labs, Musigma, Amazon, ThoughWorks, Hitachi Consulting, Samsung R&D, Dell India, HSBC, Huwei Technology, Zoho Corporation,

It's hard to say. It would depend on how the demand for the course works out. But you do have a fair chance.

There is no age limit for students belong to SC/ST & SCA. Course is of Minimum-3 years & Maximum-6 years
Qualification: Students must have cleared Intermediate standard (12th) with 60% marks in any of these subjects:
Selection Process:
Students will we selected through the counseling process. The couns

The fees for mechanical diploma for 3-4 year course is 60000 to 1 lakh. If you are getting a government college or if you have a private college then it should be more.

If you are a student of BE mechanical then you can do game design and development after completing your under graduation.

Please find below some good colleges to pursue B.Sc. Visual Communication in Chennai:
1. Asian Memorial College of Arts & Science
2. Chennai National College of Arts & Science
3. D. G. Vaishnav College
4. Dharmamurthi Rao Bahadur Calavala Cunnan Chettys Hindu College
5. Guru Nanak College.

You can't do the same together. You have to finish one and then pursue the another one.