CBSE 12th

You need minimum 75% in best 5 subjects to be eligible for admission in NITs or IITs.

Apart from MBBS, BDS is the next preferred course by medical professional.
Apart from MBBS, BDS, other options are also there like B.Sc Biological Science, Nursing, Agriculture and B Pharm.

After 12th, you can go for B.Com and simultaneously prepare for MBA and try to get in any top B-School of India and go for Finance specialisation. Else, CA is the most common option.

Graduation admissions will be done on the basis of 12th. So, wait for the board results to get declared.

All colleges are provided scholarship who complete the noms of scholarship.

Yes, you can join after 12th.
Some options are:
AAFT School of Cinema - :
Bachelor Degree 3 yrs Course - B.SC (cinema) + Diploma in Cinematography.
Masters Degree 2 yrs Course - M.SC (cinema) + PG Diploma in Cinematography.
CREO Valley School Of Film & Television -:
It is recognised by Bangalore University to offer Certificate and Diploma Courses in Film Making and Cinematography.
FTII Pune - : Three Year Post Graduate Diploma in Cinematography.

According to your statement, here are a few options:
BBA- International Business, Finance, Marketing
Psychology
Actuarial Science if you had math
International Studies
Economics (Hons.)
Apart from this programme, you can think of these fields
Journalism
English (Hons.)
Foreign Language
Social Work
Anthropology
Philosophy
Sociology
So, choose the field according to your caliber and interest.

No, I don't think so. Your marks are good, but I don't think that's enough for getting a government college.
Give other entrance exams also.
Good luck.

You will get 3 chances to appear for JEE Mains. You can take coaching from a good institute to prepare for the same.