B.Sc

Yes, you can pursue the same just check the eligibility for the particular institution.

The subject combination is physics, chemistry and biology. Instead of biology, you can have botany or zoology.
But please let me know how you have passed 12th without physics, is there any board which has such subject combination without physics?

The fee structure for B.Sc in interior designing vary from college to college. It may be in range of 3 lacs to 15 lacs for the complete course.
For a better understanding of colleges offering this course, you can visit this link.
https://www.shiksha.com/design/interior-design/colleges/b-sc-colleges-in

Yes, there are certain government exams conducted by the universities in India if you want do B.Sc. From there you have to write entrance exam and qualify them in order to get a good seat. B.Sc. Entrance exams are conducted by many universities like BHU, Allahabad, DU, etc.

Check this link for B.Sc courses that are available in Osmania University:
https://www.shiksha.com/university/ou-osmania-university-hyderabad-25100/courses/bsc-bc.

You need to apply online on the Delhi University website. There is no entrance. Your percentage in best four subjects is considered. Once the application deadline is over, all colleges come out with their cut-off percentage for different courses. You can visit the colleges where you meet the cut-off

Hi,
As you have completed your +2 exam, you can now fill the forms for B.Sc. Nursing course. Many colleges offer this course and you have to check their norms individually. B.Sc. Nursing admissions is based on the entrance exams held between April-June.

Yes, they offered this course. You can get more info about this course by given link
https://www.shiksha.com/college/the-oxford-college-of-science-h-s-r-layout-bangalore-3049