CBSE 12th

You should pursue BJMC (Bachelor in journalism and mass communication).
You can be a wildlife photographer, event photographer, photographer of a newspaper, etc.
You can also work as a photographer for police forces.

Dear,
To get admitted in NITs or IITs, you need to score at least 75% marks.

Hi,
There are many Diploma courses available after 10+2. All depends on your interest areas.
Few of them are:
Diploma in Hotel Management
Diploma in animation and multimedia
Diploma in Fire and safety technology
Marine field related Diploma courses
Diploma in Interior designing
Diploma courses related to computers and programming

No, you need to give SRMJEE to get into SRM. Management quota is there if you want to get in without giving the entrance exam.

Dear Diptimani Shukla, you can pursue BBA which has got more scope to settle down immediately in a respectable position. I suggest you pursue BBA from a good college. All the best.

Go through NCERT.
Solve more and more questions.
Try to solve previous year questions and question banks also.
IIT is undoubtedly the best college for engineering in India.