CBSE 12th

Nothing is impossible, in my point of view, you should study class 12th book of account and prepare your account base, and it will help in B.Com. Do not worry and study hard. All the best.

If you belong from general category, then your chance are very poor, you will don't get anything please try state colleges and private colleges.

Definitely, there are 40000 seats in Rajasthan, your rank is good you will definitely get this branch in any college.

Yes, you can take admission in this college.

You either have to choose any one option. You can't carry out both of them fulltime. Hence, if you choose BBA, and then MBA you can learn music production by side but not as a full time course with a degree.

NDA stands for national defense academy
The National Defense Academy is the Joint Services academy of the Indian Armed Forces, where cadets of the three services, the Army, the Navy and the Air Force train together before they go on to respective service academies for further pre-commissioning training. The NDA is located in Khadakwasla, Pune, Maharashtra. Go through the syllabus for joining NDA you need to clear three stages written, ssb interview and medical
So work hard.

If you will secure a rank under 20000, then you will get it, otherwise there is no chance.

Kindly visit this link:
https://www.shiksha.com/b-tech/resources/jee-mains-college-predictor