CBSE 12th

After 12th, you will have to give the National Defence Academy exam. You will have to prepare for the interview round also. In addition, there are certain eligibility requirements like 6/6 eyesight, height, i.e. minimum 5'7" for men and weight, etc.
https://www.shiksha.com/exams/nda

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

Yes, you can get admission in this course and the fee is not fixed. Every college has its own fee structure.

Yes, you can apply for any course, as there is no eligibility age requirement for any course. However, some colleges may ask for a gap certificate for admission. You can make that document from the local court.

There are 5 subjects in NIOS for class 12th commerce. For further information, check this link:
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2738350/

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

Hi,
No, you will have to give LPU NEST for the admission. Other way around is not possible.

Hi,
With 110/200 marks in NATA 2019 exams and 91.16% in class 12th, you have chances of securing admission in SPA, Anna University. Counselling is conducted through TNEA and you have to be registered with TNEA for the counselling process.

After Giving Supplementary Exams you will have 2 marksheet of 12th. Generally colleges take admission till 15 August. You will get your marks soon then you can apply for admission in Colleges. Some private colleges do take admission till September. You can apply there too. So be cool and prepare for your Supplementary Exams. Good luck for your exams.

There is very less chances of Getting any college. And college you will get be mostly private. I think you should go for B.Sc. Which will be much better for your career according to your Marks.