NDA

Read daily newspaper focus on maths and work according to the syllabus. Visit the link to know more about the exam pattern and syllabus https://www.shiksha.com/exams/nda-exam-syllabus.

If your age is in between 16.5 to 19.5 then you are eligible for NDA examination. Well prepare your self for the examination visit the link to know more about the exam pattern and syllabus https://www.shiksha.com/exams/nda-exam-syllabus
once you cleared examination then clear ssb interview and medical examination.

No, females are not eligible for NDA. Only male candidates are eligible for the examination.

Yes, a commerce student is eligible for applying for NDA examination.

The National Defence Academy NDA 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 academy for further pre-commission training. The NDA is located in Khadakwasla, Pune, Maharashtra. It is the first tri-service academy in the world. If you want to know more visit the link below
https://www.shiksha.com/exams/nda-exam-syllabus.

No official date has been released by the UPSC but hope so it will be happening in the month of June. And it's also pretty not sure as everything depends on the conditions. If the conditions becomes even worse then I think NDA 1 can be cancelled this year and NDA 2 will only take place. Hope for the betterment so that all exam get postponed should be rescheduled and student's don't face any future career problems.

It depends on what you want to pursue. For NDA, your marks don't matter much. In NDA, they can choose a person with 65% marks and can also deny a person with 95% marks. They need personality, attitude and working abilities which will suit defence forces. While talking about IIT's they are the best colleges not only in INDIA but among the top 100 of the world {some, not all}. Getting into IITs is not easy but if you get into them the lifestyle, character, image, etc. will change and I am pretty sure that a person in an IIT is also among the respected one in the society.

Yes, you have to apply for the navy exam and the application forms are issued annually by the naval department for entrance and if you have once cleared the exam then you will be called for physical and medical and then you are shortlisted to get a joining letter from Navy.

Visit the link to know more about the exam
https://www.shiksha.com/exams/nda-exam.