B.Com

Yes, in all likelihood, B.Com is headed towards an entrance exam.
The modalities are still being worked out as how it is going to be conducted and what will be the syllabus of the entrance.

Generally, the college is decided on basis of the cut-off. You would need to be clear on the percentage in 12th to be able to select. However mostly, DU, BHU and IP university are preferred.
You can refer top the link for college ranking:
https://www.shiksha.com/accounting-commerce/ranking/top-commerce-colleges-in-india/97-2-0-0-0

If you know basics of programming then you can go for different courses in IT like C , C+ , JAVA, .NET, etc. programming languages. Other many opportunities are available or join a course you are interested in. It may start your career in IT sector.

B.Com (Honors) is slightly better than B.Com program. It will give you and your career a better edge over B.Com.

There is not much difference in average salaries of different kind of graduates in campus placement. Both BBA and B.Com graduates get almost similar packages.

BBA which stands for Bachelor's in Business Administration is a degree which gives a detailed perspective on the various areas of management such as marketing, finance, etc. Whereas B.Com gives a bird's eye view of subjects such as taxation, audit, law, communication, financial management, accounts, statistics, etc.

Yes, you can. Also, have a look at VGU-Jaipur and Chandigarh University.

There are many courses to pursue after B.Com. You can go for MBA in Australia or Canada. These countries have good universities for pursuing MBA.