Colleges in Coimbatore

https://www.shiksha.com/college/psg-college-of-technology-psgct-coimbatore-19398/admission
Here are the complete details of the previous cut-off of the college from which you can get an idea about the excepted cut-off of the college.

https://www.shiksha.com/university/tamil-nadu-agricultural-university-coimbatore-23625/questions
Here are the complete admission details about the admission procedure.
Kindly follow the link.

PSG College of Technology offers B.Sc. Courses in the following disciplines as under.
1. B.Sc. Applied Science
2. B.Sc. Computer Science and Design
Hence B.Sc. Viscom course is not available at PSG College of Technology.

Yes, you can join in the TIPS College, Coimbatore in the foreign category/NRI quota. You will have to pay more fees though for this course.

The eligibility criteria for MA in Economics at PSGCAS is given below.
Educational qualifications : UG Passed with Economics/ Econometrics/ Mathematics/ Statistics/ Business Economics /B.Com/ BBM .
So, from above you can apply here.

The fee structure may differ from organization to organization as per the duration, mode of learning, and based on some other things like - Faculty Guidance, Material Placement Assistance, etc.
To know more about the fee structure for this course, I would suggest visiting- https://imarticus.org and can drop your query through the Live Chat Support or else can even visit one of the training centers based in - Mumbai, Thane, Pune, Chennai, Banglore, Hyderabad, Delhi, Gurgaon, and Ahmedabad.
Good Luck !