B.Sc

It would be very hard and troublesome for you, if your sketching is not good. Also, you should have good knowledge about programming and computer software. Professional Studies in gaming usually requires students to be very good in graphics design. If you can learn Photoshop and drawing along with course then you can go for it.

Entrance Exams are norms now and they are everywhere. Some colleges require minimum marks in class 12th. If you qualify for the criteria, then you are eligible for appearing in their entrance examination.

You can check out the options given in the link https://www.shiksha.com/science/colleges/b-sc-biotechnology-colleges-delhi-ncr. This link contains list of all the private college in Delhi and Noida for your desired subject.

Engineering in what exactly? Engineering has many branches and all are very different from each other. So, it is hard to tell exactly what is better or the worst. As for B.Sc in interior design, it is a professional course and it can be very good if you do it from a good college. Same goes for B.Tech, if the college is good, so will be the course.

It is completely other side of the river. Commerce student can't pursue Bachelors in Science in any subject as in physics chemistry biology. It became very difficult for you and you cannot cope up with Science. So it is better that you opt for your own line commerce and don't waste that 2year study of accounts business studies economics. Take decision deliberately. Best of luck.

Hope this link helps you: https://www.google.co.in/amp/s/www.shiksha.com/science/course/amp/b-sc-hons-in-physics-panjab-university-chandigarh-271794?espv=1.

Don't know about Loyola College, but the common eligibility is as follows and may help you.
B.Sc. Physics Eligibility1. 10+2 completed from a recognized educational board
2. 10+2 must be completed in Science Stream
3. Physics, Chemistry, Mathematics/Biology, English are compulsory