Hello,

It's good that you're thinking of appearing for nda, and it's a welcome change that now even girls are being allowed into this, if you're in 9th standard then it's too early to start your preparation for NDA, also you need to sustain your interest, yes if  you have free time then go through the syllabus, previous year papers to get an idea about the pattern of the exam, what can help you in preparation for NDA is if you are already focused on your academic studies, that helps a lot in the sense you don't have to put in extra efforts in terms of conceptual understanding, of course practice will be needed to analyze your  preparation level, as of now focus on your studies, that should be a priority for you, and as I said when you get free time try to go through the syllabus, past papers etc, as NDA covers majorly 11th and 12th standard syllabus, so once  you get into these classes, focus well in your studies, try to give your best, this will make your foundation quite strong. and you will be able to manage your preparation well.