Greetings !!

For NDA Exam, quantitative section covers the following topics :

1. Arithmetic
2. Mensuration
3. Algebra
4. Geometry
5. Trigonometry
6. Statistics

I Recommend you clear the basic concepts of all these topics which are coming under 10 th and  11/12 th syllabus  and revise , practice as much as you can. Try to solve previous years question papers of at least last 10 years. Definitely you will be able to clear the exam. If any doubts, pls feel free to ask.

Wish You All The Best !

Thank You !!