NDA

To know about all detail information regarding NDA exam is it the below Shiksha link
https://www.shiksha.com/exams/nda.

One of my friend after clearing NDA is not in merchant Navy on a high post.

Maths questions in this type of exam consist from basic to intermediate level. So prepare your basics from 7th and 8th class and also intermediate level.

Yes, you can get employed in Indian Army and also other defense force. They will provide certain vacancies in every recruitment for women. So, you can go for it. All the best.

The NDA exams are conducts twice a year in the months of April and September. Hence, in my opinion, you have to strongly focus on 12th exams. There is no need to do any things extra for NDA exam. But for familiarity, you must have to attend this exam.

If you want to join NDA, then you will have to study Mathematics. Take commerce with mathematics in Intermediate and focus on Math and English. The paper is quite tough for NDA but with preparation is beatable. Your NCC background will help you in SSB. Also, you can opt for NCC Special Entry after graduation.

Please specify the name of the course for which you wish to apply.

Commerce students can apply for only army through NDA. The eligibility criteria is as follows:
The candidate should be an unmarried male citizen of India
Age limit: 16.5-19 yearsMinimum qualification: 12th pass from any stream
For Airforce and Navy the candidate must have physics and maths at 12th which you will not have as you are from commerce. NDA is conducted twice a year by UPSC. Check the website of UPSC at www.upsc.gov.in for more details.