Hello aspirant

Maths syllabus of NDA is as follows 

Algebra 

Trigonometry 

Matrices and determinants

Analytical geometry in 2D and 3D

Differential calculas

Integral calculas

Vectors 

Statistics and probability 

And preferred books of NDA maths are

Ncert books 11 and 12

Solved question papers for practice by NDA or by arihant

NA arihant

NA RS Agarwal 

Good Luck 

Hey Deenesh! The important books for UPSC NDA are

• Mathematics for NDA and NA: National Defence Academy and Naval Academy (English) by R S Aggarwal
• The Pearson Guide for Mathematics for NDA Entrance Examination (English) by Pearson India
• NDA& NA- Entrance Examination for Mathematics Study Package (English) by Arihant. 
• Quantitative aptitude for competitive examinations paperback- By R.S Aggarwal.

Mathematics syllabus for NDA paper 

• Algebra
• Matrices and Determinants
• Trigonometry
• Analytical Geometry of Two and Three Dimensions 
• Differential Calculus
• Integral Calculus and Differential Equations
• Vector Algebra
• Statistics and Probability