for current affair you can go with

general knowledge 2018 for useful for ssc NDA IPS and other

by RAJAT WASAN

and one more book i would recomment

its LUSCENT!

hope this will help you

• For mathematics;-
• By arihant experts - it contain section wise solved paper (maths/english/general ability)

• Pathfinder for NDA & NA Entrance Examination National Defence Academy/Naval Academy Conducted by UPSC

Hey

NDA Mathematics books

1. Mathematics for NDA and NA:  National defense academy and naval Academy.                By Aggarwal R.  S

2. Pathfinder for NDA and NA entrance examination

By arihant experts

3. Study package Mathematics NDA and NA

By Manjul Tyagi

NDA general ability book

1. Compendium General Knowledge

By kumar sundram