CBSE 12th

Hi Abhishek.
Assuming you are from Science background. And, if you are good in Maths, you can go for B.Sc in Maths or Statistics / computer Science / Economics etc. These requires you to be good in Maths not in physics or chemistry Orr biology. Hope this helps. Ask any query at any time.

Yes, you can get admission here. This is a good college. Good luck.

Yes, you can do this course from Government College of art. You will have to pay around INR. 11,000 per semester.
Good luck.

Yes, you can apply for commerce college.

Here's the link to check all the eligibility criteria to get into this college:
https://www.shiksha.com/college/goswami-ganesh-dutta-s-d-college-chandigarh-22606/admission

Any courses like B.Com, BBA or other B.Sc courses can be pursued after class 12th to do MSW.

Please refer the below link for college in Maharashtra for B.Com studies. You can check the best college rankings, fee, Admission process and other details. Student's reviews about the college will help you find the best college based on placements and infrastructure provided. https://www.google.com/url?sa=t&source=web&rct=j&url=https://www.shiksha.com/accounting-commerce/ranking/top-commerce-colleges-in-maharashtra/97-2-114-0-0&ved=2ahUKEwi_k_f5qKLiAhVG7HMBHQDxBZAQFjAEegQICRAB&usg=AOvVaw3VtSnvPfuGGSfGnOlkibhl&cshid=1558087780453.

In Madhya Pradesh colleges like Graffiti Institute of Fashion Technology, Indore affiliated to Raja Mansingh Tomar Musiac & Arts University, a M.P. Govt. university specializing in design & fine arts courses can take admissions after 12th for degree programme in Interior Design. Kindly visit wwwdotgraffitidotedudotin for more information or contact nine eight nine three zero four one four three zero

You can get your self enrolled in BBA (Banking & Insurance) to start with.